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96-490: The bridge is used regularly by freight trains of both BNSF and Union Pacific Railroad , as well as by Amtrak passenger trains on routes connecting Portland with Seattle and with Chicago via Spokane, Washington . The 8.8 in the name is the distance, in miles, from Portland's Union Station , the same as for Bridge 5.1 (across the Willamette River ) and Bridge 9.6 on the same line. The Oregon Slough Railroad Bridge

192-512: A cyclothem . Cyclothems are thought to have their origin in glacial cycles that produced fluctuations in sea level , which alternately exposed and then flooded large areas of continental shelf. The woody tissue of plants is composed mainly of cellulose, hemicellulose, and lignin. Modern peat is mostly lignin, with a content of cellulose and hemicellulose ranging from 5% to 40%. Various other organic compounds, such as waxes and nitrogen- and sulfur-containing compounds, are also present. Lignin has

288-445: A goods station (freight station in US). Smaller locomotives transferred the rail cars from the sidings and goods stations to a classification yard , where each car was coupled to one of several long-distance trains being assembled there, depending on that car's destination. When long enough, or based on a schedule, each long-distance train was then dispatched to another classification yard. At

384-479: A broad gauge connection. (A metre-gauge connection between the two broad gauge networks, the Transandine Railway was constructed but is not currently in service. See also Trans-Andean railways . ) Most other countries have few rail systems. The standard gauge in the east, connect with Paraguay and Uruguay. The railways of Africa were mostly started by colonial powers to bring inland resources to port. There

480-447: A direct rail connection. Despite the closure of many minor lines carload shipping from one company to another by rail remains common. Railroads were early users of automatic data processing equipment, starting at the turn of the twentieth century with punched cards and unit record equipment . Many rail systems have turned to computerized scheduling and optimization for trains which has reduced costs and helped add more train traffic to

576-452: A location, whose origin/destination was a rail terminal yard. This product sometimes arrived at/departed from that yard by means of a through freight. At a minimum, a way freight comprised a locomotive and caboose, to which cars called pickups and setouts were added or dropped off along the route. For convenience, smaller consignments might be carried in the caboose , which prompted some railroads to define their cabooses as way cars, although

672-513: A new, but little-used, connection to the standard-gauge network is available at Zahedan . The four major Eurasian networks link to neighboring countries and to each other at several break of gauge points. Containerization has facilitated greater movement between networks, including a Eurasian Land Bridge . Canada , Mexico and the United States are connected by an extensive, unified standard gauge rail network. The one notable exception

768-673: A port. Rail freight uses many types of goods wagon (UIC) or freight car (US). These include box cars (US) or covered wagons (UIC) for general merchandise, flat cars (US) or flat wagons (UIC) for heavy or bulky loads, well wagons or "low loader" wagons for transporting road vehicles; there are refrigerator vans for transporting food, simple types of open-topped wagons for transporting bulk material, such as minerals and coal , and tankers for transporting liquids and gases. Most coal and aggregates are moved in hopper wagons or gondolas (US) or open wagons (UIC) that can be filled and discharged rapidly, to enable efficient handling of

864-417: A process called carbonization . Carbonization proceeds primarily by dehydration , decarboxylation , and demethanation. Dehydration removes water molecules from the maturing coal via reactions such as Decarboxylation removes carbon dioxide from the maturing coal: while demethanation proceeds by reaction such as In these formulas, R represents the remainder of a cellulose or lignin molecule to which

960-420: A rail line through Central America to South America. Brazil has a large rail network, mostly metre gauge, with some broad gauge. It runs some of the heaviest iron ore trains in the world on its metre gauge network. Argentina have Indian gauge networks in the south, standard gauge in the east and metre gauge networks in the north. The metre gauge networks are connected at one point, but there has never been

1056-466: A result, three major rail gauges are in use. A standard gauge Trans-Australian Railway spans the continent. In 2011, North American railroads operated 1,471,736 freight cars and 31,875 locomotives, with 215,985 employees, They originated 39.53 million carloads (averaging 63 tons each) and generated $ 81.7 billion in freight revenue. The largest (Class 1) U.S. railroads carried 10.17 million intermodal containers and 1.72 million trailers. Intermodal traffic

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1152-499: A road vehicle. Several types of cargo are not suited for containerization or bulk; these are transported in special cars custom designed for the cargo. Less-than-carload freight is any load that does not fill a boxcar or box motor or less than a Boxcar load . Historically in North America, trains might be classified as either way freight or through freight. A way freight generally carried less-than-carload shipments to/from

1248-527: A switch in fuels happened in London in the late sixteenth and early seventeenth centuries. Historian Ruth Goodman has traced the socioeconomic effects of that switch and its later spread throughout Britain and suggested that its importance in shaping the industrial adoption of coal has been previously underappreciated. The development of the Industrial Revolution led to the large-scale use of coal, as

1344-549: A tenth. Indonesia and Australia export the most, followed by Russia . The word originally took the form col in Old English , from reconstructed Proto-Germanic * kula ( n ), from Proto-Indo-European root * g ( e ) u-lo- "live coal". Germanic cognates include the Old Frisian kole , Middle Dutch cole , Dutch kool , Old High German chol , German Kohle and Old Norse kol . Irish gual

1440-721: A third of its electricity . Some iron and steel -making and other industrial processes burn coal. The extraction and burning of coal damages the environment , causing premature death and illness, and it is the largest anthropogenic source of carbon dioxide contributing to climate change . Fourteen billion tonnes of carbon dioxide were emitted by burning coal in 2020, which is 40% of total fossil fuel emissions and over 25% of total global greenhouse gas emissions . As part of worldwide energy transition , many countries have reduced or eliminated their use of coal power . The United Nations Secretary General asked governments to stop building new coal plants by 2020. Global coal use

1536-639: A town or area, by hopping a freight train is sometimes referred to as "catching-out", as in catching a train out of town. Bulk cargo constitutes the majority of tonnage carried by most freight railroads. Bulk cargo is commodity cargo that is transported unpackaged in large quantities. These cargo are usually dropped or poured, with a spout or shovel bucket, as a liquid or solid, into a railroad car . Liquids, such as petroleum and chemicals, and compressed gases are carried by rail in tank cars . Hopper cars are freight cars used to transport dry bulk commodities such as coal , ore , grain , track ballast , and

1632-438: A viable competitor where water transport is available. Freight trains are sometimes illegally boarded by individuals who do not have the money or the desire to travel legally, a practice referred to as " hopping ". Most hoppers sneak into train yards and stow away in boxcars. Bolder hoppers will catch a train "on the fly", that is, as it is moving, leading to occasional fatalities, some of which go unrecorded. The act of leaving

1728-403: A weight basis. This composition reflects partly the composition of the precursor plants. The second main fraction of coal is ash, an undesirable, noncombustable mixture of inorganic minerals. The composition of ash is often discussed in terms of oxides obtained after combustion in air: Of particular interest is the sulfur content of coal, which can vary from less than 1% to as much as 4%. Most of

1824-406: A weight composition of about 54% carbon, 6% hydrogen, and 30% oxygen, while cellulose has a weight composition of about 44% carbon, 6% hydrogen, and 49% oxygen. Bituminous coal has a composition of about 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur, on a weight basis. The low oxygen content of coal shows that coalification removed most of the oxygen and much of the hydrogen

1920-506: Is a combustible black or brownish-black sedimentary rock , formed as rock strata called coal seams . Coal is mostly carbon with variable amounts of other elements , chiefly hydrogen , sulfur , oxygen , and nitrogen . Coal is a type of fossil fuel , formed when dead plant matter decays into peat which is converted into coal by the heat and pressure of deep burial over millions of years. Vast deposits of coal originate in former wetlands called coal forests that covered much of

2016-625: Is also a cognate via the Indo-European root. The conversion of dead vegetation into coal is called coalification . At various times in the geologic past, the Earth had dense forests in low-lying areas. In these wetlands, the process of coalification began when dead plant matter was protected from oxidation , usually by mud or acidic water, and was converted into peat . The resulting peat bogs , which trapped immense amounts of carbon, were eventually deeply buried by sediments. Then, over millions of years,

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2112-429: Is burned in a turbine). Hot exhaust gases from the turbine are used to raise steam in a heat recovery steam generator which powers a supplemental steam turbine . The overall plant efficiency when used to provide combined heat and power can reach as much as 94%. IGCC power plants emit less local pollution than conventional pulverized coal-fueled plants. Other ways to use coal are as coal-water slurry fuel (CWS), which

2208-594: Is entirely vertical; however, metamorphism may cause lateral changes of rank, irrespective of depth. For example, some of the coal seams of the Madrid, New Mexico coal field were partially converted to anthracite by contact metamorphism from an igneous sill while the remainder of the seams remained as bituminous coal. The earliest recognized use is from the Shenyang area of China where by 4000 BC Neolithic inhabitants had begun carving ornaments from black lignite. Coal from

2304-455: Is made when metallurgical coal (also known as coking coal ) is baked in an oven without oxygen at temperatures as high as 1,000 °C, driving off the volatile constituents and fusing together the fixed carbon and residual ash. Metallurgical coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace . The carbon monoxide produced by its combustion reduces hematite (an iron oxide ) to iron. Pig iron , which

2400-409: Is more abundant, and anthracite. The % carbon in coal follows the order anthracite > bituminous > lignite > brown coal. The fuel value of coal varies in the same order. Some anthracite deposits contain pure carbon in the form of graphite . For bituminous coal, the elemental composition on a dry, ash-free basis of 84.4% carbon, 5.4% hydrogen, 6.7% oxygen, 1.7% nitrogen, and 1.8% sulfur, on

2496-547: Is moved by containers stacked on transport ships; 26% of all container transshipment is carried out in China. As of 2005 , some 18 million total containers make over 200 million trips per year. Use of the same basic sizes of containers across the globe has lessened the problems caused by incompatible rail gauge sizes in different countries by making transshipment between different gauge trains easier. While typically containers travel for many hundreds or even thousands kilometers on

2592-406: Is not carried on the train, only the trailer. Piggyback trains are common in the United States, where they are also known as trailer on flat car or TOFC trains, but they have lost market share to containers (COFC), with longer, 53-foot containers frequently used for domestic shipments. There are also roadrailer vehicles, which have two sets of wheels, for use in a train, or as the trailer of

2688-567: Is owned by private companies that also operate freight trains on those tracks. Since the Staggers Rail Act of 1980, the freight rail industry in the U.S. has been largely deregulated. Freight cars are routinely interchanged between carriers, as needed, and are identified by company reporting marks and serial numbers. Most have computer readable automatic equipment identification transponders. With isolated exceptions , freight trains in North America are hauled by diesel locomotives , even on

2784-840: Is still the main use of freight railroads. Greater connectivity opens the rail network to other freight uses including non-export traffic. Rail network connectivity is limited by a number of factors, including geographical barriers, such as oceans and mountains, technical incompatibilities, particularly different track gauges and railway couplers , and political conflicts. The largest rail networks are located in North America and Eurasia. Long distance freight trains are generally longer than passenger trains, with greater length improving efficiency. Maximum length varies widely by system. ( See longest trains for train lengths in different countries.) Many countries are moving to increase speed and volume of rail freight in an attempt to win markets over or to relieve overburdened roads and/or speed up shipping in

2880-515: Is the busiest freight line in the world Such economies of scale drive down operating costs. Some freight trains can be over 7 km long. Containerization is a system of intermodal freight transport using standard shipping containers (also known as ' ISO containers' or 'isotainers') that can be loaded with cargo, sealed and placed onto container ships , railroad cars , and trucks . Containerization has revolutionized cargo shipping. As of 2009 approximately 90% of non- bulk cargo worldwide

2976-472: Is the isolated Alaska Railroad , which is connected to the main network by rail barge . Due primarily to external factors such as geography and the commodity mix favoring commodities such as coal, the modal share of freight rail in North America is one of the highest worldwide. Rail freight is well standardized in North America, with Janney couplers and compatible air brakes . The main variations are in loading gauge and maximum car weight. Most trackage

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3072-945: Is the use of railways and trains to transport cargo as opposed to human passengers . A freight train , cargo train, or goods train is a group of freight cars (US) or goods wagons ( International Union of Railways ) hauled by one or more locomotives on a railway, transporting cargo all or some of the way between the shipper and the intended destination as part of the logistics chain. Trains may haul bulk material , intermodal containers , general freight or specialized freight in purpose-designed cars. Rail freight practices and economics vary by country and region. When considered in terms of ton-miles or tonne-kilometers hauled, energy efficiency can be greater with rail transportation than with other means. Maximum economies are typically realized with bulk commodities (e.g., coal ), especially when hauled over long distances. Moving goods by rail often involves transshipment costs, particularly when

3168-452: Is used as fuel. 27.6% of world energy was supplied by coal in 2017 and Asia used almost three-quarters of it. Other large-scale applications also exist. The energy density of coal is roughly 24 megajoules per kilogram (approximately 6.7 kilowatt-hours per kg). For a coal power plant with a 40% efficiency, it takes an estimated 325 kg (717 lb) of coal to power a 100 W lightbulb for one year. In 2022, 68% of global coal use

3264-630: Is used in India for selected freight-only lines. In some countries rolling highway , or rolling road, trains are used; trucks can drive straight onto the train and drive off again when the end destination is reached. A system like this is used on the Channel Tunnel between the United Kingdom and France, as well as on the Konkan Railway in India. In other countries, the tractor unit of each truck

3360-463: The Atchison, Topeka and Santa Fe Railway (Santa Fe) in 1996 to form BNSF Railway. A fire was seen on the span and put out on February 26, 2019, temporarily shutting down all train traffic. The bridge's swing span is opened for river traffic an average of only 12 times per month. Operation of the swing span is performed by an on-call operator. Freight rail transport Rail freight transport

3456-691: The Bronze Age (3000–2000 BC), where it formed part of funeral pyres . In Roman Britain , with the exception of two modern fields, "the Romans were exploiting coals in all the major coalfields in England and Wales by the end of the second century AD". Evidence of trade in coal, dated to about AD 200, has been found at the Roman settlement at Heronbridge , near Chester ; and in the Fenlands of East Anglia , where coal from

3552-512: The Fushun mine in northeastern China was used to smelt copper as early as 1000 BC. Marco Polo , the Italian who traveled to China in the 13th century, described coal as "black stones ... which burn like logs", and said coal was so plentiful, people could take three hot baths a week. In Europe, the earliest reference to the use of coal as fuel is from the geological treatise On Stones (Lap. 16) by

3648-590: The Midlands was transported via the Car Dyke for use in drying grain. Coal cinders have been found in the hearths of villas and Roman forts , particularly in Northumberland , dated to around AD 400. In the west of England, contemporary writers described the wonder of a permanent brazier of coal on the altar of Minerva at Aquae Sulis (modern day Bath ), although in fact easily accessible surface coal from what became

3744-702: The Somerset coalfield was in common use in quite lowly dwellings locally. Evidence of coal's use for iron -working in the city during the Roman period has been found. In Eschweiler , Rhineland , deposits of bituminous coal were used by the Romans for the smelting of iron ore . No evidence exists of coal being of great importance in Britain before about AD 1000, the High Middle Ages . Coal came to be referred to as "seacoal" in

3840-491: The coal gap in the Permian–Triassic extinction event , where coal is rare. Favorable geography alone does not explain the extensive Carboniferous coal beds. Other factors contributing to rapid coal deposition were high oxygen levels, above 30%, that promoted intense wildfires and formation of charcoal that was all but indigestible by decomposing organisms; high carbon dioxide levels that promoted plant growth; and

3936-444: The steam engine took over from the water wheel . In 1700, five-sixths of the world's coal was mined in Britain. Britain would have run out of suitable sites for watermills by the 1830s if coal had not been available as a source of energy. In 1947 there were some 750,000 miners in Britain, but the last deep coal mine in the UK closed in 2015. A grade between bituminous coal and anthracite

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4032-407: The 13th century; the wharf where the material arrived in London was known as Seacoal Lane, so identified in a charter of King Henry III granted in 1253. Initially, the name was given because much coal was found on the shore, having fallen from the exposed coal seams on cliffs above or washed out of underwater coal outcrops, but by the time of Henry VIII , it was understood to derive from the way it

4128-526: The 2010s, most North American Class I railroads have adopted some form of precision railroading . The Guatemala railroad is currently inactive, preventing rail shipment south of Mexico. Panama has freight rail service, recently converted to standard gauge, that parallels the Panama Canal . A few other rail systems in Central America are still in operation, but most have closed. There has never been

4224-578: The Carboniferous, and suggested that climatic and tectonic factors were a more plausible explanation, reconstruction of ancestral enzymes by phylogenetic analysis corroborated a hypothesis that lignin degrading enzymes appeared in fungi approximately 200 MYa. One likely tectonic factor was the Central Pangean Mountains , an enormous range running along the equator that reached its greatest elevation near this time. Climate modeling suggests that

4320-587: The Central Pangean Mountains contributed to the deposition of vast quantities of coal in the late Carboniferous. The mountains created an area of year-round heavy precipitation, with no dry season typical of a monsoon climate. This is necessary for the preservation of peat in coal swamps. Coal is known from Precambrian strata, which predate land plants. This coal is presumed to have originated from residues of algae. Sometimes coal seams (also known as coal beds) are interbedded with other sediments in

4416-407: The Earth's tropical land areas during the late Carboniferous ( Pennsylvanian ) and Permian times. Coal is used primarily as a fuel. While coal has been known and used for thousands of years, its usage was limited until the Industrial Revolution . With the invention of the steam engine , coal consumption increased. In 2020, coal supplied about a quarter of the world's primary energy and over

4512-623: The European Union participate in an auto-gauge network. The United Kingdom is linked to this network via the Channel Tunnel . The Marmaray project connects Europe with eastern Turkey, Iran, and the Middle East via a rail tunnel under the Bosphorus . The 57-km Gotthard Base Tunnel improved north–south rail connections when it opened in 2016. Spain and Portugal are mostly broad gauge, though Spain has built some standard gauge lines that connect with

4608-539: The European high-speed passenger network. A variety of electrification and signaling systems is in use, though this is less of an issue for freight; however, clearances prevent double-stack service on most lines. Buffer-and-screw couplings are generally used between freight vehicles, although there are plans to develop an automatic coupler compatible with the Russian SA3. See Railway coupling conversion . The countries of

4704-563: The Greek scientist Theophrastus (c. 371–287 BC): Among the materials that are dug because they are useful, those known as anthrakes [coals] are made of earth, and, once set on fire, they burn like charcoal [anthrakes]. They are found in Liguria ;... and in Elis as one approaches Olympia by the mountain road; and they are used by those who work in metals. Outcrop coal was used in Britain during

4800-613: The Spokane line would also follow the north bank, running east from Vancouver. East from Portland, the south bank of the Columbia already had a rail line, owned by the Oregon Railroad and Navigation Company (later absorbed by Union Pacific Railroad ). As with the other two opening bridges built concurrently on the same Portland–Vancouver line, the span was designed by bridge engineer Ralph Modjeski . Construction started in 1906, and most of

4896-478: The age of online shopping . In Japan, trends towards adding rail freight shipping are more due to availability of workers rather than other concerns. Rail freight tonnage as a percent of total moved by country: Rail freight ton-milage as a percent of total moved by country: There are four major interconnecting rail networks on the Eurasian land mass, along with other smaller national networks. Most countries in

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4992-633: The bridge structural work was completed by mid-1908. The first train crossed the span on October 23, 1908, and the bridge opened for regular use in November 1908. The 334-foot-long (102 m) swing-span section is located at the south end. The remainder consists of seven shorter fixed-truss spans, each approximately 162 ft (49 m) in length. The bridge's owner and operator was the Spokane, Portland and Seattle Railway until that company's merger with other railroads in 1970 to form Burlington Northern Railroad (BN) and then BN until it, in turn, merged with

5088-623: The electrified Northeast Corridor . Ongoing freight-oriented development includes upgrading more lines to carry heavier and taller loads, particularly for double-stack service, and building more efficient intermodal terminals and transload facilities for bulk cargo. Many railroads interchange in Chicago, and a number of improvements are underway or proposed to eliminate bottlenecks there. The U.S. Rail Safety Improvement Act of 2008 mandates eventual conversion to Positive Train Control signaling. In

5184-421: The elements (chiefly rain) such as grain, sugar, and fertilizer. Open cars are used for commodities such as coal, which can get wet and dry out with less harmful effect. Hopper cars have been used by railways worldwide whenever automated cargo handling has been desired. Rotary car dumpers simply invert the car to unload it, and have become the preferred unloading technology, especially in North America; they permit

5280-430: The evolution of the first trees . But bacteria and fungi did not immediately evolve the ability to decompose lignin, so the wood did not fully decay but became buried under sediment, eventually turning into coal. About 300 million years ago, mushrooms and other fungi developed this ability, ending the main coal-formation period of earth's history. Although some authors pointed at some evidence of lignin degradation during

5376-512: The factors involved in coalification, temperature is much more important than either pressure or time of burial. Subbituminous coal can form at temperatures as low as 35 to 80 °C (95 to 176 °F) while anthracite requires a temperature of at least 180 to 245 °C (356 to 473 °F). Although coal is known from most geologic periods , 90% of all coal beds were deposited in the Carboniferous and Permian periods. Paradoxically, this

5472-498: The form of iron pyrite (FeS 2 ). Being a dense mineral, it can be removed from coal by mechanical means, e.g. by froth flotation . Some sulfate occurs in coal, especially weathered samples. It is not volatilized and can be removed by washing. Minor components include: As minerals, Hg, As, and Se are not problematic to the environment, especially since they are only trace components. They become however mobile (volatile or water-soluble) when these minerals are combusted. Most coal

5568-409: The former Soviet Union , along with Finland and Mongolia , participate in a Russian gauge -compatible network, using SA3 couplers . Major lines are electrified. Russia's Trans-Siberian Railroad connects Europe with Asia, but does not have the clearances needed to carry double-stack containers. Numerous connections are available between Russian-gauge countries with their standard-gauge neighbors in

5664-475: The heat and pressure of deep burial caused the loss of water, methane and carbon dioxide and increased the proportion of carbon. The grade of coal produced depended on the maximum pressure and temperature reached, with lignite (also called "brown coal") produced under relatively mild conditions, and sub-bituminous coal , bituminous coal , or anthracite coal (also called "hard coal" or "black coal") produced in turn with increasing temperature and pressure. Of

5760-466: The idea of the first double-stack intermodal car in 1977. SP then designed the first car with ACF Industries that same year. At first it was slow to become an industry standard, then in 1984 American President Lines started working with the SP and that same year, the first all "double stack" train left Los Angeles, California for South Kearny, New Jersey , under the name of "Stacktrain" rail service. Along

5856-431: The increasing tendency of the anthracite to break with a conchoidal fracture , similar to the way thick glass breaks. As geological processes apply pressure to dead biotic material over time, under suitable conditions, its metamorphic grade or rank increases successively into: There are several international standards for coal. The classification of coal is generally based on the content of volatiles . However

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5952-414: The latter ceased, and the public sector took over passenger transportation. Railroads are subject to the network effect : the more points they connect to, the greater the value of the system as a whole. Early railroads were built to bring resources, such as coal, ores and agricultural products from inland locations to ports for export. In many parts of the world, particularly the southern hemisphere, that

6048-462: The like. This type of car is distinguished from a gondola car (US) or open wagon (UIC) in that it has opening doors on the underside or on the sides to discharge its cargo. The development of the hopper car went along with the development of automated handling of such commodities, with automated loading and unloading facilities. There are two main types of hopper car: open and covered; Covered hopper cars are used for cargo that must be protected from

6144-517: The materials. Rail transport is very energy-efficient, and much more environmentally friendly than road transport. Compared to road transport whісh employs the uѕе of trucks (lorries) , rail transportation ensures that goods that соuld оtherwіѕе be transported on а number of trucks are transported in а single shipment. Thіѕ saves а lot аѕ fаr аѕ cost connected to the transportation are concerned. Rail freight transport also has very low external costs . Therefore, many governments have been stimulating

6240-453: The morphology and some properties of the original plant. In many coals, individual macerals can be identified visually. Some macerals include: In coalification huminite is replaced by vitreous (shiny) vitrinite . Maturation of bituminous coal is characterized by bitumenization , in which part of the coal is converted to bitumen , a hydrocarbon-rich gel. Maturation to anthracite is characterized by debitumenization (from demethanation) and

6336-405: The most important distinction is between thermal coal (also known as steam coal), which is burnt to generate electricity via steam; and metallurgical coal (also known as coking coal), which is burnt at high temperature to make steel . Hilt's law is a geological observation that (within a small area) the deeper the coal is found, the higher its rank (or grade). It applies if the thermal gradient

6432-407: The nature of Carboniferous forests, which included lycophyte trees whose determinate growth meant that carbon was not tied up in heartwood of living trees for long periods. One theory suggested that about 360 million years ago, some plants evolved the ability to produce lignin , a complex polymer that made their cellulose stems much harder and more woody. The ability to produce lignin led to

6528-817: The next classification yard, cars are resorted . Those that are destined for stations served by that yard are assigned to local trains for delivery. Others are reassembled into trains heading to classification yards closer to their final destination. A single car might be reclassified or switched in several yards before reaching its final destination, a process that made rail freight slow and increased costs. Because, of this, freight rail operators have continually tried to reduce these costs by reducing or eliminating switching in classification yards through techniques such as unit trains and containerization , and in some countries these have completely replaced mixed freight trains. In many countries, railroads have been built to haul one commodity, such as coal or ore, from an inland point to

6624-455: The number of double bonds between carbon). As carbonization proceeds, aliphatic compounds convert to aromatic compounds . Similarly, aromatic rings fuse into polyaromatic compounds (linked rings of carbon atoms). The structure increasingly resembles graphene , the structural element of graphite. Chemical changes are accompanied by physical changes, such as decrease in average pore size. The macerals are coalified plant parts that retain

6720-456: The pre-combustion treatment, turbine technology (e.g. supercritical steam generator ) and the age of the plant. A few integrated gasification combined cycle (IGCC) power plants have been built, which burn coal more efficiently. Instead of pulverizing the coal and burning it directly as fuel in the steam-generating boiler, the coal is gasified to create syngas , which is burned in a gas turbine to produce electricity (just like natural gas

6816-462: The rails. Freight railroads' relationship with other modes of transportation varies widely. There is almost no interaction with airfreight , close cooperation with ocean-going freight and a mostly competitive relationship with long distance trucking and barge transport. Many businesses ship their products by rail if they are shipped long distance because it can be cheaper to ship in large quantities by rail than by truck; however barge shipping remains

6912-413: The railway, Swiss experience shows that with properly coordinated logistics, it is possible to operate a viable intermodal (truck + rail) cargo transportation system even within a country as small as Switzerland . Most flatcars (flat wagons) cannot carry more than one standard 40-foot (12.2 m) container on top of another because of limited vertical clearance , even though they usually can carry

7008-487: The railway. Many factories did not have direct rail access. This meant that freight had to be shipped through a goods station , sent by train and unloaded at another goods station for onward delivery to another factory. When lorries (trucks) replaced horses it was often economical and faster to make one movement by road. In the United States, particularly in the West and Midwest , towns developed with railway and factories often had

7104-427: The reacting groups are attached. Dehydration and decarboxylation take place early in coalification, while demethanation begins only after the coal has already reached bituminous rank. The effect of decarboxylation is to reduce the percentage of oxygen, while demethanation reduces the percentage of hydrogen. Dehydration does both, and (together with demethanation) reduces the saturation of the carbon backbone (increasing

7200-501: The shipper or receiver lack direct rail access. These costs may exceed that of operating the train itself, a factor that practices such as containerization , trailer-on-flatcar or rolling highway aim to minimize. Traditionally, large shippers built factories and warehouses near rail lines and had a section of track on their property called a siding where goods were loaded onto or unloaded from rail cars. Other shippers had their goods hauled ( drayed ) by wagon or truck to or from

7296-529: The standard-gauge network of North Korea in the east, with the Russian-gauge network of Russia, Mongolia, and Kazakhstan in the north, and with the meter-gauge network of Vietnam in the south. India and Pakistan operate entirely on broad gauge networks. Indo-Pakistani wars and conflicts currently restrict rail traffic between the two countries to two passenger lines. There are also links from India to Bangladesh and Nepal, and from Pakistan to Iran, where

7392-399: The sulfur and most of the nitrogen is incorporated into the organic fraction in the form of organosulfur compounds and organonitrogen compounds . This sulfur and nitrogen are strongly bound within the hydrocarbon matrix. These elements are released as SO 2 and NO x upon combustion. They cannot be removed, economically at least, otherwise. Some coals contain inorganic sulfur, mainly in

7488-424: The switch of freight from trucks onto trains, because of the environmental benefits that it would bring. Railway transport and inland navigation (also known as 'inland waterway transport' (IWT) or 'inland shipping') are similarly environmentally friendly modes of transportation, and both form major parts of the 2019 European Green Deal . In Europe (particularly Britain), many manufacturing towns developed before

7584-466: The term equally applied to boxcars used for that purpose. Way stops might be industrial sidings, stations/flag stops, settlements, or even individual residences. With the difficulty of maintaining an exact schedule, way freights yielded to scheduled passenger and through trains. They were often mixed trains that served isolated communities. Like passenger service generally, way freights and their smaller consignments became uneconomical. In North America,

7680-449: The use of simpler, tougher, and more compact (because sloping ends are not required) gondola cars instead of hoppers. The heaviest trains in the world carry bulk traffic such as iron ore and coal . Loads can be 130 tonnes per wagon and tens of thousands of tonnes per train. Daqin Railway transports more than 1 million tonnes of coal to the east sea shore of China every day and in 2009

7776-613: The way the train transferred from the SP to Conrail . It saved shippers money and now accounts for almost 70 percent of intermodal freight transport shipments in the United States, in part due to the generous vertical clearances used by U.S. railroads. These lines are diesel-operated with no overhead wiring . Double stacking is also used in Australia between Adelaide , Parkes , Perth and Darwin . These are diesel-only lines with no overhead wiring. Saudi Arabian Railways use double-stack in its Riyadh - Dammam corridor. Double stacking

7872-425: The weight of two. Carrying half the possible weight is inefficient. However, if the rail line has been built with sufficient vertical clearance, a double-stack car can accept a container and still leave enough clearance for another container on top. Both China and India run electrified double-stack trains with overhead wiring. In the United States, Southern Pacific Railroad (SP) with Malcom McLean came up with

7968-711: The west (throughout Europe) and south (to China, North Korea, and Iran via Turkmenistan). While the USSR had important railway connections to Turkey (from Armenia) and to Iran (from Azerbaijan's Nakhchivan enclave), these have been out of service since the early 1990s, since a number of frozen conflicts in the Caucasus region have forced the closing of the rail connections between Russia and Georgia via Abkhazia, between Armenia and Azerbaijan , and between Armenia and Turkey . China has an extensive standard-gauge network. Its freight trains use Janney couplers . China's railways connect with

8064-415: The world's coal-generated electricity. Efforts around the world to reduce the use of coal have led some regions to switch to natural gas and renewable energy . In 2018 coal-fired power station capacity factor averaged 51%, that is they operated for about half their available operating hours. Coke is a solid carbonaceous residue that is used in manufacturing steel and other iron-containing products. Coke

8160-660: Was 6.2% of tonnage originated and 12.6% of revenue. The largest commodities were coal, chemicals, farm products, nonmetallic minerals and intermodal. Coal alone was 43.3% of tonnage and 24.7% of revenue. The average haul was 917 miles. Within the U.S. railroads carry 39.9% of freight by ton-mile, followed by trucks (33.4%), oil pipelines (14.3%), barges (12%) and air (0.3%). Railways carried 17.1% of EU freight in terms of tonne-km, compared to road transport (76.4%) and inland waterways (6.5%). Unlike passenger trains, freight trains are rarely named. Some, however, have gained names either officially or unofficially. Coal Coal

8256-574: Was 8.3 billion tonnes in 2022, and is set to remain at record levels in 2023. To meet the Paris Agreement target of keeping global warming below 2 °C (3.6 °F) coal use needs to halve from 2020 to 2030, and "phasing down" coal was agreed upon in the Glasgow Climate Pact . The largest consumer and importer of coal in 2020 was China , which accounts for almost half the world's annual coal production, followed by India with about

8352-574: Was based on the trading of this commodity. Coal continues to arrive on beaches around the world from both natural erosion of exposed coal seams and windswept spills from cargo ships. Many homes in such areas gather this coal as a significant, and sometimes primary, source of home heating fuel. Coal consists mainly of a black mixture of diverse organic compounds and polymers. Of course, several kinds of coals exist, with variable dark colors and variable compositions. Young coals (brown coal, lignite) are not black. The two main black coals are bituminous, which

8448-600: Was built in 1906–1908 by the Northern Pacific Railway (NP) for use by the Spokane, Portland and Seattle Railway (SP&S), as part of construction of a new line between Vancouver, Washington and Portland. SP&S was formed jointly by NP and Great Northern Railway , originally as the Portland & Seattle Railway, to build and ultimately operate new railroad lines from Portland to Seattle and Portland to Spokane . It

8544-504: Was carried to London by sea. In 1257–1259, coal from Newcastle upon Tyne was shipped to London for the smiths and lime -burners building Westminster Abbey . Seacoal Lane and Newcastle Lane, where coal was unloaded at wharves along the River Fleet , still exist. These easily accessible sources had largely become exhausted (or could not meet the growing demand) by the 13th century, when underground extraction by shaft mining or adits

8640-602: Was developed in the Soviet Union , or in an MHD topping cycle . However these are not widely used due to lack of profit. In 2017 38% of the world's electricity came from coal, the same percentage as 30 years previously. In 2018 global installed capacity was 2 TW (of which 1TW is in China) which was 30% of total electricity generation capacity. The most dependent major country is South Africa, with over 80% of its electricity generated by coal; but China alone generates more than half of

8736-408: Was developed. The alternative name was "pitcoal", because it came from mines. Cooking and home heating with coal (in addition to firewood or instead of it) has been done in various times and places throughout human history, especially in times and places where ground-surface coal was available and firewood was scarce, but a widespread reliance on coal for home hearths probably never existed until such

8832-490: Was during the Late Paleozoic icehouse , a time of global glaciation . However, the drop in global sea level accompanying the glaciation exposed continental shelves that had previously been submerged, and to these were added wide river deltas produced by increased erosion due to the drop in base level . These widespread areas of wetlands provided ideal conditions for coal formation. The rapid formation of coal ended with

8928-528: Was little regard for eventual interconnection. As a result, there are a variety of gauge and coupler standards in use. A 3 ft 6 in ( 1,067 mm ) gauge network with Janney couplers serves southern Africa. East Africa uses metre gauge . North Africa uses standard gauge , but potential connection to the European standard gauge network is blocked by the Arab–Israeli conflict . Rail developed independently in different parts of Australia and, as

9024-550: Was once known as "steam coal" as it was widely used as a fuel for steam locomotives . In this specialized use, it is sometimes known as "sea coal" in the United States. Small "steam coal", also called dry small steam nuts (DSSN), was used as a fuel for domestic water heating . Coal played an important role in industry in the 19th and 20th century. The predecessor of the European Union , the European Coal and Steel Community ,

9120-594: Was renamed Spokane , Portland & Seattle Railway in early 1908 (before opening any track sections) after construction of the Portland–Spokane line got under way before the Seattle line. The planned new railroad was commonly referred to as the "North Bank road" (road being short for railroad or railroad line), or North Bank line, because the Seattle line would follow the Columbia River's north bank as far as Kelso and

9216-430: Was used for electricity generation. Coal burnt in coal power stations to generate electricity is called thermal coal . It is usually pulverized and then burned in a furnace with a boiler . The furnace heat converts boiler water to steam , which is then used to spin turbines which turn generators and create electricity. The thermodynamic efficiency of this process varies between about 25% and 50% depending on

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