58-539: Keele Yard (originally known as Vincent Yard ) is a rail yard on the Toronto Transit Commission 's (TTC's) Line 2 Bloor–Danforth of the Toronto subway system. Keele Yard is located between Dundas West and Keele stations. The yard consists of four tracks each long enough to hold two six-car trains. Each track enters an underground carhouse at the east end of the yard providing interior storage for half of
116-450: A main line . Main-line yards are often composed of an up yard and a down yard, linked to the associated direction of travel . There are different types of yards, and different parts within a yard, depending on how they are built. For freight cars , the overall yard layout is typically designed around a principal switching (US term) or shunting (UK) technique: In the case of all classification or sorting yards, human intelligence plays
174-502: A slipformed (or pre-cast) concrete base (development 2000s). The 'embedded rail structure', used in the Netherlands since 1976, initially used a conventional UIC 54 rail embedded in concrete, and later developed (late 1990s) to use a 'mushroom' shaped SA42 rail profile; a version for light rail using a rail supported in an asphalt concrete –filled steel trough has also been developed (2002). Modern ladder track can be considered
232-440: A "clickety-clack" sound. Unless it is well-maintained, jointed track does not have the ride quality of welded rail and is less desirable for high speed trains . However, jointed track is still used in many countries on lower speed lines and sidings , and is used extensively in poorer countries due to the lower construction cost and the simpler equipment required for its installation and maintenance. A major problem of jointed track
290-648: A common sleeper. The straight rails could be angled at these joints to form primitive curved track. The first iron rails laid in Britain were at the Darby Ironworks in Coalbrookdale in 1767. When steam locomotives were introduced, starting in 1804, the track then in use proved too weak to carry the additional weight. Richard Trevithick 's pioneering locomotive at Pen-y-darren broke the plateway track and had to be withdrawn. As locomotives became more widespread in
348-415: A continuous reinforced concrete slab and the use of pre-cast pre-stressed concrete units laid on a base layer. Many permutations of design have been put forward. However, ballastless track has a high initial cost, and in the case of existing railroads the upgrade to such requires closure of the route for a long period. Its whole-life cost can be lower because of the reduction in maintenance. Ballastless track
406-481: A development of baulk road. Ladder track utilizes sleepers aligned along the same direction as the rails with rung-like gauge restraining cross members. Both ballasted and ballastless types exist. Modern track typically uses hot-rolled steel with a profile of an asymmetrical rounded I-beam . Unlike some other uses of iron and steel , railway rails are subject to very high stresses and have to be made of very high-quality steel alloy. It took many decades to improve
464-426: A fuelling point and other minor maintenance facilities. A good example of this was Newport 's Godfrey Road stabling point, which has since been closed. Stabling sidings can be just a few roads or large complexes like Feltham Sidings. They are sometimes electrified with a third rail or OLE . An example of a stabling point with third rail would be Feltham marshalling yard which is being made into carriage sidings for
522-694: A major US coach yard is Sunnyside Yard in New York City , operated by Amtrak . Those that are principally used for storage, such as the West Side Yard in New York, are called "layup yards" or "stabling yards." Coach yards are commonly flat yards because unladen passenger coaches are heavier than unladen freight carriages. In the UK, a stabling point is a place where rail locomotives are parked while awaiting their next turn of duty. A stabling point may be fitted with
580-766: A primary role in setting a strategy for the switching operations ; the fewer times coupling operations need to be made and the less distance traveled, the faster the operation, the better the strategy and the sooner the newly configured consist can be joined to its outbound train. A large freight yard may include the following components: Freight yards may have multiple industries adjacent to them where railroad cars are loaded or unloaded and then stored before they move on to their new destination. Coach yards (American English) or stabling yards or carriage sidings (British English) are used for sorting, storing and repairing passenger cars . These yards are located in metropolitan areas near large stations or terminals. An example of
638-465: A temperature roughly midway between the extremes experienced at that location. (This is known as the "rail neutral temperature".) This installation procedure is intended to prevent tracks from buckling in summer heat or pulling apart in the winter cold. In North America, because broken rails are typically detected by interruption of the current in the signaling system, they are seen as less of a potential hazard than undetected heat kinks. Joints are used in
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#1732851545607696-449: A type of locomotive. Cars or wagons in a yard may be sorted by numerous categories, including railway company , loaded or unloaded, destination, car type, or whether they need repairs. Yards are normally built where there is a need to store rail vehicles while they are not being loaded or unloaded, or are waiting to be assembled into trains. Large yards may have a tower to control operations. Many yards are located at strategic points on
754-462: Is 115 to 141 lb/yd (57 to 70 kg/m). In Europe, rail is graded in kilograms per metre and the usual range is 40 to 60 kg/m (81 to 121 lb/yd). The heaviest mass-produced rail was 155 pounds per yard (77 kg/m), rolled for the Pennsylvania Railroad . The rails used in rail transport are produced in sections of fixed length. Rail lengths are made as long as possible, as
812-408: Is a manual process requiring a reaction crucible and form to contain the molten iron. North American practice is to weld 1 ⁄ 4 -mile-long (400 m) segments of rail at a rail facility and load it on a special train to carry it to the job site. This train is designed to carry many segments of rail which are placed so they can slide off their racks to the rear of the train and be attached to
870-400: Is a series of tracks in a rail network for storing, sorting, or loading and unloading rail vehicles and locomotives . Yards have many tracks in parallel for keeping rolling stock or unused locomotives stored off the main line , so that they do not obstruct the flow of traffic. Cars or wagons are moved around by specially designed yard switcher locomotives (US) or shunter locomotives (UK),
928-488: Is cracking around the bolt holes, which can lead to breaking of the rail head (the running surface). This was the cause of the Hither Green rail crash which caused British Railways to begin converting much of its track to continuous welded rail. Where track circuits exist for signalling purposes, insulated block joints are required. These compound the weaknesses of ordinary joints. Specially-made glued joints, where all
986-459: Is graded by its linear density , that is, its mass over a standard length. Heavier rail can support greater axle loads and higher train speeds without sustaining damage than lighter rail, but at a greater cost. In North America and the United Kingdom, rail is graded in pounds per yard (usually shown as pound or lb ), so 130-pound rail would weigh 130 lb/yd (64 kg/m). The usual range
1044-402: Is scarce and where tonnage or speeds are high. Steel is used in some applications. The track ballast is customarily crushed stone, and the purpose of this is to support the sleepers and allow some adjustment of their position, while allowing free drainage. A disadvantage of traditional track structures is the heavy demand for maintenance, particularly surfacing (tamping) and lining to restore
1102-568: Is scheduled to go past the Keele Yard at about 6:00 a.m. The number of work cars using the yard will vary depending on work scheduled at the west end of Line 2. Keele Yard was originally named Vincent Yard after Vincent Street, a short street that used to run east from Dundas Street , north of Bloor Street . The Dundas streetcars turned around at Vincent until the construction of Dundas West station. The street has since been replaced with The Crossways apartment building complex. Opened in 1966,
1160-456: Is starting to paint rails white to lower the peak temperatures reached in summer days. After new segments of rail are laid, or defective rails replaced (welded-in), the rails can be artificially stressed if the temperature of the rail during laying is cooler than what is desired. The stressing process involves either heating the rails, causing them to expand, or stretching the rails with hydraulic equipment. They are then fastened (clipped) to
1218-754: Is to bolt them together using metal fishplates (jointbars in the US), producing jointed track . For more modern usage, particularly where higher speeds are required, the lengths of rail may be welded together to form continuous welded rail (CWR). Jointed track is made using lengths of rail, usually around 20 m (66 ft) long (in the UK) and 39 or 78 ft (12 or 24 m) long (in North America), bolted together using perforated steel plates known as fishplates (UK) or joint bars (North America). Fishplates are usually 600 mm (2 ft) long, used in pairs either side of
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#17328515456071276-435: Is usually considered for new very high speed or very high loading routes, in short extensions that require additional strength (e.g. railway stations), or for localised replacement where there are exceptional maintenance difficulties, for example in tunnels. Most rapid transit lines and rubber-tyred metro systems use ballastless track. Early railways (c. 1840s) experimented with continuous bearing railtrack, in which
1334-571: The British Rail Class 701 EMU . Track (rail transport) A railway track ( British English and UIC terminology ) or railroad track ( American English ), also known as a train track or permanent way (often " perway " in Australia or " P Way " in Britain and India), is the structure on a railway or railroad consisting of the rails , fasteners , railroad ties (sleepers, British English) and ballast (or slab track ), plus
1392-490: The Greenwood Yard , and can put trains more efficiently into service at the west end of Line 2. Also, the yard provides extra storage space which became useful when all T1 subway cars were moved from Line 1 Yonge–University to Line 2 with the introduction of TR trains on Line 1. After a derailment on January 22, 2020, the Keele Yard was temporarily shut down until its rails could be inspected for defects. A train leaving
1450-489: The London, Midland and Scottish Railway pioneered the conversion to flat-bottomed rail in Britain, though earlier lines had made some use of it. Jointed rails were used at first because contemporary technology did not offer any alternative. However, the intrinsic weakness in resisting vertical loading results in the ballast becoming depressed and a heavy maintenance workload is imposed to prevent unacceptable geometrical defects at
1508-537: The 1810s and 1820s, engineers built rigid track formations, with iron rails mounted on stone sleepers, and cast-iron chairs holding them in place. This proved to be a mistake, and was soon replaced with flexible track structures that allowed a degree of elastic movement as trains passed over them. Traditionally, tracks are constructed using flat-bottomed steel rails laid on and spiked or screwed into timber or pre-stressed concrete sleepers (known as ties in North America), with crushed stone ballast placed beneath and around
1566-415: The 20th century, rail track used softwood timber sleepers and jointed rails, and a considerable amount of this track remains on secondary and tertiary routes. In North America and Australia, flat-bottomed rails were typically fastened to the sleepers with dog spikes through a flat tie plate. In Britain and Ireland, bullhead rails were carried in cast-iron chairs which were spiked to the sleepers. In 1936,
1624-400: The bolt heads on the same side of the rail. Small gaps which function as expansion joints are deliberately left between the rail ends to allow for expansion of the rails in hot weather. European practice was to have the rail joints on both rails adjacent to each other, while North American practice is to stagger them. Because of these small gaps, when trains pass over jointed tracks they make
1682-458: The continuous welded rail when necessary, usually for signal circuit gaps. Instead of a joint that passes straight across the rail, the two rail ends are sometimes cut at an angle to give a smoother transition. In extreme cases, such as at the end of long bridges, a breather switch (referred to in North America and Britain as an expansion joint ) gives a smooth path for the wheels while allowing
1740-499: The defective track had been missing a "kick plate", a custom-made item, which would have guided the wheel. Also, a TTC roadmaster (who does track inspections) found that the switch was not properly fastened with braces to the track bed; the braces were either missing or improperly installed. 43°39′23″N 79°27′19″W / 43.65636°N 79.45527°W / 43.65636; -79.45527 Rail yard A rail yard , railway yard , railroad yard (US) or simply yard ,
1798-440: The desired track geometry and smoothness of vehicle running. Weakness of the subgrade and drainage deficiencies also lead to heavy maintenance costs. This can be overcome by using ballastless track. In its simplest form this consists of a continuous slab of concrete (like a highway structure) with the rails supported directly on its upper surface (using a resilient pad). There are a number of proprietary systems; variations include
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1856-440: The end of one rail to expand relative to the next rail. A sleeper (tie or crosstie) is a rectangular object on which the rails are supported and fixed. The sleeper has two main roles: to transfer the loads from the rails to the track ballast and the ground underneath, and to hold the rails to the correct width apart (to maintain the rail gauge ). They are generally laid transversely to the rails. Various methods exist for fixing
1914-428: The gaps are filled with epoxy resin , increase the strength again. As an alternative to the insulated joint, audio frequency track circuits can be employed using a tuned loop formed in approximately 20 m (66 ft) of the rail as part of the blocking circuit. Some insulated joints are unavoidable within turnouts. Another alternative is an axle counter , which can reduce the number of track circuits and thus
1972-474: The iron came loose, began to curl, and intruded into the floors of the coaches. The iron strap rail coming through the floors of the coaches came to be referred to as "snake heads" by early railroaders. The Deeside Tramway in North Wales used this form of rail. It opened around 1870 and closed in 1947, with long sections still using these rails. It was one of the last uses of iron-topped wooden rails. Rail
2030-402: The joints between rails are a source of weakness. Throughout the history of rail production, lengths have increased as manufacturing processes have improved. The following are lengths of single sections produced by steel mills , without any thermite welding . Shorter rails may be welded with flashbutt welding , but the following rail lengths are unwelded. Welding of rails into longer lengths
2088-440: The joints. The joints also needed to be lubricated, and wear at the fishplate (joint bar) mating surfaces needed to be rectified by shimming. For this reason jointed track is not financially appropriate for heavily operated railroads. Timber sleepers are of many available timbers, and are often treated with creosote , chromated copper arsenate , or other wood preservatives. Pre-stressed concrete sleepers are often used where timber
2146-863: The mid- to late-20th century used rails 39 feet (11.9 m) long so they could be carried in gondola cars ( open wagons ), often 40 feet (12.2 m) long; as gondola sizes increased, so did rail lengths. According to the Railway Gazette International the planned-but-cancelled 150-kilometre rail line for the Baffinland Iron Mine , on Baffin Island , would have used older carbon steel alloys for its rails, instead of more modern, higher performance alloys, because modern alloy rails can become brittle at very low temperatures. Early North American railroads used iron on top of wooden rails as an economy measure but gave up this method of construction after
2204-620: The number of insulated rail joints required. Most modern railways use continuous welded rail (CWR), sometimes referred to as ribbon rails or seamless rails . In this form of track, the rails are welded together by utilising flash butt welding to form one continuous rail that may be several kilometres long. Because there are few joints, this form of track is very strong, gives a smooth ride, and needs less maintenance; trains can travel on it at higher speeds and with less friction. Welded rails are more expensive to lay than jointed tracks, but have much lower maintenance costs. The first welded track
2262-404: The outside of sharp curves compared to the rails on the inside. Rails can be supplied pre-drilled with boltholes for fishplates or without where they will be welded into place. There are usually two or three boltholes at each end. Rails are produced in fixed lengths and need to be joined end-to-end to make a continuous surface on which trains may run. The traditional method of joining the rails
2320-423: The quality of the materials, including the change from iron to steel. The stronger the rails and the rest of the trackwork, the heavier and faster the trains the track can carry. Other profiles of rail include: bullhead rail ; grooved rail ; flat-bottomed rail (Vignoles rail or flanged T-rail); bridge rail (inverted U–shaped used in baulk road ); and Barlow rail (inverted V). North American railroads until
2378-682: The rail by special clips that resist longitudinal movement of the rail. There is no theoretical limit to how long a welded rail can be. However, if longitudinal and lateral restraint are insufficient, the track could become distorted in hot weather and cause a derailment. Distortion due to heat expansion is known in North America as sun kink , and elsewhere as buckling. In extreme hot weather special inspections are required to monitor sections of track known to be problematic. In North American practice, extreme temperature conditions will trigger slow orders to allow for crews to react to buckling or "sun kinks" if encountered. The German railway company Deutsche Bahn
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2436-425: The rail ends and bolted together (usually four, but sometimes six bolts per joint). The bolts have alternating orientations so that in the event of a derailment and a wheel flange striking the joint, only some of the bolts will be sheared, reducing the likelihood of the rails misaligning with each other and exacerbating the derailment. This technique is not applied universally; European practice being to have all
2494-494: The rail to the sleeper. Historically, spikes gave way to cast iron chairs fixed to the sleeper. More recently, springs (such as Pandrol clips ) are used to fix the rail to the sleeper chair. Sometimes rail tracks are designed to be portable and moved from one place to another as required. During construction of the Panama Canal , tracks were moved around excavation works. These track gauge were 5 ft ( 1,524 mm ) and
2552-630: The rail was supported along its length, with examples including Brunel's baulk road on the Great Western Railway , as well as use on the Newcastle and North Shields Railway , on the Lancashire and Yorkshire Railway to a design by John Hawkshaw , and elsewhere. Continuous-bearing designs were also promoted by other engineers. The system was tested on the Baltimore and Ohio railway in the 1840s, but
2610-494: The rolling stock full size. Portable tracks have often been used in open pit mines. In 1880 in New York City , sections of heavy portable track (along with much other improvised technology) helped in the move of the ancient obelisk in Central Park to its final location from the dock where it was unloaded from the cargo ship SS Dessoug . Cane railways often had permanent tracks for the main lines, with portable tracks serving
2668-426: The sleepers in their expanded form. This process ensures that the rail will not expand much further in subsequent hot weather. In cold weather the rails try to contract, but because they are firmly fastened, cannot do so. In effect, stressed rails are a bit like a piece of stretched elastic firmly fastened down. In extremely cold weather, rails are heated to prevent "pull aparts". CWR is laid (including fastening) at
2726-407: The sleepers. Most modern railroads with heavy traffic use continuously welded rails that are attached to the sleepers with base plates that spread the load. When concrete sleepers are used, a plastic or rubber pad is usually placed between the rail and the tie plate. Rail is usually attached to the sleeper with resilient fastenings, although cut spikes are widely used in North America. For much of
2784-511: The ties (sleepers) in a continuous operation. If not restrained, rails would lengthen in hot weather and shrink in cold weather. To provide this restraint, the rail is prevented from moving in relation to the sleeper by use of clips or anchors. Attention needs to be paid to compacting the ballast effectively, including under, between, and at the ends of the sleepers, to prevent the sleepers from moving. Anchors are more common for wooden sleepers, whereas most concrete or steel sleepers are fastened to
2842-546: The underlying subgrade . It enables trains to move by providing a dependable surface for their wheels to roll upon. Early tracks were constructed with wooden or cast iron rails, and wooden or stone sleepers; since the 1870s, rails have almost universally been made from steel. The first railway in Britain was the Wollaton Wagonway , built in 1603 between Wollaton and Strelley in Nottinghamshire. It used wooden rails and
2900-422: The yard historically supplemented Greenwood Yard and stored trains for Line 2 Bloor–Danforth and Line 1 Yonge–University subways. The trains would be given some minor maintenance and have their interiors cleaned. This continued until the late 1970s when Wilson Yard was opened and all excess trains could be stored there. From that point, until 2013, it was used to store work vehicles and retired subway cars. It
2958-413: The yard partly derailed and fouled the mainline forcing a shutdown of a portion of line 2 for 4 hours during the morning rush hours. The cause was a rail in the yard with a small protrusion which lifted a wheel on the fourth car of a subway train. The protrusion was about 1.25 cm (0.49 in) thick and 20–23 cm (7.9–9.1 in) long, and located on the inside of the rail. In addition, since 2015,
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#17328515456073016-515: The yard's eight train capacity. There is a locked passage for TTC staff between the carhouse and Dundas West Station . The tracks of the Keele Yards join the mainline about 80 metres (260 ft) east of Keele Station near Indian Road. There is a double crossover between Keele Station and the Keele Yard junction. Since the Keele Yard's 2017 re-opening, most activity occurs in the late evenings and early mornings. Four trains plus some work cars use
3074-415: The yard. Each night, subway workcars typically leave the Keele Yard before 2 a.m. when the four passenger trains start to arrive. At night, the trains are tested and prepared for morning service with some system check tests occurring on the outdoor storage tracks. Workcars will return to the yard before 5:45 a.m. at which time the passenger trains start to go into morning service. The first westbound train
3132-484: Was also used for track maintenance training. Keele Yard fell into poor condition after years of inactivity. In August 2014, the TTC began rehabilitation work to place it back in service. On June 18, 2017, the TTC reopened the yard to store and service four trains overnight. The remaining yard capacity is used to store work equipment. By reopening the Keele Yard, the TTC eliminates the deadheading of trains between Keele Station and
3190-467: Was first introduced around 1893, making train rides quieter and safer. With the introduction of thermite welding after 1899, the process became less labour-intensive, and ubiquitous. Modern production techniques allowed the production of longer unwelded segments. Newer longer rails tend to be made as simple multiples of older shorter rails, so that old rails can be replaced without cutting. Some cutting would be needed as slightly longer rails are needed on
3248-432: Was found to be more expensive to maintain than rail with cross sleepers . This type of track still exists on some bridges on Network Rail where the timber baulks are called waybeams or longitudinal timbers. Generally the speed over such structures is low. Later applications of continuously supported track include Balfour Beatty 's 'embedded slab track', which uses a rounded rectangular rail profile (BB14072) embedded in
3306-475: Was the first of around 50 wooden-railed tramways built over the next 164 years. These early wooden tramways typically used rails of oak or beech, attached to wooden sleepers with iron or wooden nails. Gravel or small stones were packed around the sleepers to hold them in place and provide a walkway for the people or horses that moved wagons along the track. The rails were usually about 3 feet (0.91 m) long and were not joined - instead, adjacent rails were laid on
3364-500: Was used in Germany in 1924. and has become common on main lines since the 1950s. The preferred process of flash butt welding involves an automated track-laying machine running a strong electric current through the touching ends of two unjoined rails. The ends become white hot due to electrical resistance and are then pressed together forming a strong weld. Thermite welding is used to repair or splice together existing CWR segments. This
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