The ALCO RSD-7 was a diesel-electric locomotive of the road switcher type built by ALCO at Schenectady, New York between January 1954 and April 1956. Two versions were built, with the same RSD-7 model designation but different specifications and power ratings, although both used the ALCO 244 engine in V16 configuration. Specification DL-600 , of which only two were built, developed 2,250 hp (1,678 kW; 2,281 PS) and used the 244G engine. The revised specification DL-600A , numbering 27 locomotives, was rated at 2,400 hp (1,790 kW; 2,433 PS) and used the 244H engine. The RSD-7 was superseded by the ALCO 251 -engined ALCO RSD-15 , which looks very similar. The RSD-7 was the last ALCO diesel built with a 244 engine.
35-507: Both rode on a pair of three-axle trucks with all three axles on each truck powered; this is a C-C wheel arrangement. These trucks have an unequal axle spacing due to traction motor positioning; the outer two axles on each truck are closer together than the inner two. The RSD-7 used the GE 752 traction motor. The six-motor design allowed better tractive effort at lower speeds. The two RSD-7 demonstrators were significant for ALCO. They were built with
70-591: A civil engineer . Although he lived in Ireland , near York and at Morton in County Durham at various times, he maintained an office and a house in Newcastle. He was active in his profession until shortly before his death, on 29 May 1832. His burial was at St Andrew's Church in Newcastle. His large library, which ran to 535 volumes, was auctioned the following year, but his widow Elizabeth donated his printed reports to
105-465: A dolly in a road train or in railway bogie exchange ). It may include suspension components within it (as most rail and trucking bogies do), or be solid and in turn be suspended (as are most bogies of tracked vehicles). It may be mounted on a swivel , as traditionally on a railway carriage or locomotive, additionally jointed and sprung (as in the landing gear of an airliner ), or held in place by other means (centreless bogies). Although bogie
140-479: A semi-trailer , whether permanently attached to the frame (as on a single trailer) or making up the dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer (as when pulling doubles or triples ). Some tanks and other tracked vehicles have bogies as external suspension components (see armoured fighting vehicle suspension ). This type of bogie usually has two or more road wheels and some type of sprung suspension to smooth
175-455: A steam locomotive , the leading and trailing wheels may be mounted on bogies like Bissel trucks (also known as pony trucks ). Articulated locomotives (e.g. Fairlie , Garratt or Mallet locomotives) have power bogies similar to those on diesel and electric locomotives. A rollbock is a specialized type of bogie that is inserted under the wheels of a rail wagon/car, usually to convert for another track gauge . Transporter wagons carry
210-555: A bogie to guide the locomotive into curves while also supporting the smokebox was built by John B. Jervis in 1831. The concept took decades before it was widely accepted but eventually became a component of the vast majority of mainline locomotive designs. The first use of bogie coaches in Britain was in 1872 by the Festiniog Railway.The first standard gauge British railway to build coaches with bogies, instead of rigidly mounted axles,
245-515: A certain degree of rotational movement around a vertical axis pivot (bolster), with side bearers preventing excessive movement. More modern, bolsterless bogie designs omit these features, instead taking advantage of the sideways movement of the suspension to permit rotational movement. Modern diesel and electric locomotives are mounted on bogies. Those commonly used in North America include Type A , Blomberg , HT-C and Flexicoil trucks. On
280-430: A small rail car with axles at either end. The same effect that causes the bogies to rub against the rails at longer radius causes each of the pairs of wheels to rub on the rails and cause the screeching. Articulated bogies add a second pivot point between the two axles ( wheelsets ) to allow them to rotate to the correct angle even in these cases. In trucking , a bogie is the subassembly of axles and wheels that supports
315-455: A weight of 60,000 pounds per axle. The DL601 weighed 390,000 pounds, with 30,000 pounds added to test the gains in adhesion from the extra weight. Additional experimentation by ALCO included new fuel injection pumps and nozzles, increased fuel rack settings, and an aftercooler to reduce engine air inlet temperature. The aftercooler allowed higher density inlet air into the engine, which promoted greater fuel burning efficiency. The aftercooler became
350-436: Is any one of a number of bogie designs that allow railway equipment to safely turn sharp corners, while reducing or eliminating the "screeching" normally associated with metal wheels rounding a bend in the rails. There are a number of such designs, and the term is also applied to train sets that incorporate articulation in the vehicle, as opposed to the bogies themselves. If one considers a single bogie "up close", it resembles
385-549: Is credited with the invention of the bogie and articulation (see Articulated vehicle ) for rail vehicles. William Chapman was born on 7 March 1749 in Whitby. His father, Captain William Chapman, already had three daughters from his first marriage, but William was the first of ten children born to his second wife, Hannah Baynes. He left home in 1765, moving to Barnes, Sunderland , and then to Newcastle . Two years later, he joined
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#1733085095642420-460: Is located off-centre, so more than half the weight rests on the driving axle. The retractable stadium roof on Toronto's Rogers Centre used modified off-the-shelf train bogies on a circular rail. The system was chosen for its proven reliability. Rubber-tyred metro trains use a specialised version of railway bogies. Special flanged steel wheels are behind the rubber-tired running wheels, with additional horizontal guide wheels in front of and behind
455-673: Is smaller than a semicircle . This method would later be described in standard texts on railway masonry, such as Nicholson. Chapman was engineer for the Beverley and Barmston Drainage (1799–1810) which gave drainage and flood protection to 12,600 acres between Beverley and Lisset, in East Yorkshire, and for the Muston and Yeddingham scheme (1800–1808). This involved a Sea Cut from the River Derwent (Vale of Pickering), which diverted flood water to
490-492: Is the preferred spelling and first-listed variant in various dictionaries, bogey and bogy are also used. A bogie in the UK, or a railroad truck , wheel truck , or simply truck in North America, is a structure underneath a railway vehicle (wagon, coach or locomotive) to which axles (hence, wheels) are attached through bearings . In Indian English , bogie may also refer to an entire railway carriage . In South Africa ,
525-595: The Atchison, Topeka and Santa Fe Railway . None survived into preservation. Bogie A bogie ( / ˈ b oʊ ɡ i / BOH -ghee ) (or truck in North American English) comprises two or more wheelsets (two wheels on an axle ), in a frame, attached under a vehicle by a pivot. Bogies take various forms in various modes of transport. A bogie may remain normally attached (as on many railroad cars and semi-trailers ) or be quickly detachable (as for
560-567: The Institution of Civil Engineers in 1837. Chapman is important for his work on the theoretical design of skew bridges , as he developed the first methodical technique for their design. This was his 'spiral method', as described in Rees's Cyclopædia . It was based on work he had done for the Kildare Canal in Ireland in 1787. In this, the arch is considered as a series of arch slices, parallel to
595-534: The Merchant Navy , and was able to enrol in the Guild of Master Mariners in 1769. Next he set up as a merchant and coal fitter, and with his brother, took out a lease on collieries at St. Anthony's and Wallsend in 1778. Despite initial success, the project ran into financial difficulties, and both men were declared bankrupt in 1782. The failure did not deter him, and he worked first as a mechanical engineer and then as
630-574: The River Shannon he rebuilt the locks on the lower section of the river between Killaloe and Limerick between 1791 and 1794. For the River Orwell (1806–1808) the works included several new cuts, and also the deepening of the river channel using a steam dredger – the first time a steam dredger had been used for this purpose. Chapman was consulting engineer on the Grand Canal (Ireland) , and proposed
665-415: The arch faces and at an angle to the abutments. The arch soffit (the curved underside) is drawn out into a flat plane, a parallelogram grid drawn on this, and then these diagonal lines (each one representing an arch slice) transferred to the centring of the constructed arch. This method had been applied to the design of Finlay Bridge at Naas , employing an arch barrel based on a circular segment that
700-567: The feature that allowed the 244 to be pushed to 2400 horsepower, with a new designation of 244H. The 244H is also known as the Alco 250 engine to disassociate it from the troubled 244 engine series. The maroon, yellow and gray painted RSD-7 demonstrators began a 23-railroad, 50,000 mile demonstration tour in the Spring of 1954. The tour concluded in September 1954 and the two units were refurbished before sale to
735-637: The horizontal axis, as well. Some articulated trams have bogies located under articulations, a setup referred to as a Jacobs bogie . Often, low-floor trams are fitted with nonpivoting bogies; many tramway enthusiasts see this as a retrograde step, as it leads to more wear of both track and wheels and also significantly reduces the speed at which a tram can round a curve. In the past, many different types of bogie (truck) have been used under tramcars (e.g. Brill , Peckham, maximum traction). A maximum traction truck has one driving axle with large wheels and one nondriving axle with smaller wheels. The bogie pivot
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#1733085095642770-591: The individual axles to align with curves in addition to the bogie frame as a whole pivoting. For non-radial bogies, the more axles in the assembly, the more difficulty it has negotiating curves, due to wheel flange to rail friction. For radial bogies, the wheel sets actively steer through curves, thus reducing wear at the wheel's flange-to-rail interface and improving adhesion. In the US, radial steering has been implemented in EMD and GE locomotives. The EMD version, designated HTCR,
805-594: The intention of challenging the Fairbanks-Morse Train Master H-24-66 , which entered the market in 1953. When built in early 1954 the RSD-7 delivered the highest continuous tractive effort of all diesel locomotives then available, and could also boast 75% more dynamic braking capacity than any standard freight unit available at the time. The superlatives of the RSD-7 allowed two units to do the work of three conventional 4-motor units. The dynamic brake system
840-411: The load and connect the bogies to the cars. Usually, the train floor is at a level above the bogies, but the floor of the car may be lower between bogies, such as for a bilevel rail car to increase interior space while staying within height restrictions , or in easy-access, stepless-entry, low-floor trains. Key components of a bogie include: The connections of the bogie with the rail vehicle allow
875-447: The principle of radial steering. The Cleminson system involved three axles, each mounted on a frame that had a central pivot; the central axle could slide transversely. The three axles were connected by linkages that kept them parallel on the straight and moved the end ones radially on a curve, so that all three axles were continually at right angles to the rails. The configuration, invented by British engineer John James Davidge Cleminson,
910-599: The ride across rough terrain. Bogie suspensions keep much of their components on the outside of the vehicle, saving internal space. Although vulnerable to antitank fire, they can often be repaired or replaced in the field. William Chapman (engineer) William Chapman (1749–1832) was an English engineer. Born in Whitby , he worked on the construction of the Old and Humber Docks in Hull , as well as many drainage and canal projects. He
945-514: The running wheels, as well. The unusually large flanges on the steel wheels guide the bogie through standard railroad switches , and in addition keep the train from derailing in case the tires deflate . To overcome breaks of gauge some bogies are being fitted with variable gauge axles (VGA) so that they can operate on two different gauges. These include the SUW 2000 system from ZNTK Poznań . Radial-steering trucks, also known as radial bogies, allow
980-489: The same concept to the level of a flatcar specialized to take other cars as its load. In archbar or diamond frame bogies, the side frames are fabricated rather than cast . Tram bogies are much simpler in design because of their axle load, and the tighter curves found on tramways mean tram bogies almost never have more than two axles. Furthermore, some tramways have steeper gradients and vertical as well as horizontal curves, which means tram bogies often need to pivot on
1015-698: The sea via Scalby Beck, just north of Scarborough. At Scarborough, North Yorkshire , between 1801 and 1831, Chapman extended the East Pier and Vincent's pier and built the West Pier, all in massive masonry. The harbour as it exists today is essentially Chapman's work. At Leith (1826–31), Chapman built the Eastern pier and the Western breakwater. These provided a safe approach to the old inner harbour Seaham in County Durham
1050-574: The term bogie is often alternatively used to refer to a freight or goods wagon (shortened from bogie wagon ). A locomotive with a bogie was built by engineer William Chapman in 1812. It hauled itself along by chains and was not successful, but Chapman built a more successful locomotive with two gear-driven bogies in 1814. The bogie was first used in America for wagons on the Quincy Granite Railroad in 1829. The first successful locomotive with
1085-741: Was first granted a patent in the UK in 1883. The system was widely used on British narrow-gauge rolling stock, such as on the Isle of Man and Manx Northern Railways . The Holdfast Bay Railway Company in South Australia , which later became the Glenelg Railway Company, purchased Cleminson-configured carriages in 1880 from the American Gilbert & Bush Company for its 1600 mm ( 5 ft 3 in ) broad-gauge line. An articulated bogie
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1120-507: Was his largest harbour project, with two piers, a north basin excavated from the solid rock (which provided building material for the piers) and a south harbour. By 1845 more than 700,000 tons of coal a year were being shipped from Seaham. Two other major dock projects were collaborations: with John Rennie at Hull ; and with Daniel Alexander at the East London Dock . Chapman worked on a number of canal and river navigation schemes. On
1155-853: Was made standard equipment for the SD70 series , first sold in 1993. The HTCR in operation had mixed results and relatively high purchase and maintenance costs. EMD subsequently introduced the HTSC truck, essentially the HTCR stripped of radial components. GE introduced their version in 1995 as a buyer option for the AC4400CW and later Evolution Series locomotives. However, it also met with limited acceptance because of its relatively high purchase and maintenance costs, and customers have generally chosen GE Hi-Ad standard trucks for newer and rebuilt locomotives. A 19th century configuration of self-steering axles on rolling stock established
1190-508: Was mounted on top the long hood, leaving room in the short hood for a steam generator. The RSD-7 included a number of firsts for ALCO: it was the first ALCO built with the notched corner sand fills, the first ALCO to use the coiled air brake intercoolers mounted just above and ahead of the radiator intakes, and the first ALCO to use the then new Model 710 water cooled turbocharger in a 16-cylinder engine. The two demonstrators were numbered DL600 and DL601. The DL600 weighed 360,000 pounds, giving it
1225-565: Was the Midland Railway in 1874. Bogies serve a number of purposes: Usually, two bogies are fitted to each carriage , wagon or locomotive , one at each end. Another configuration is often used in articulated vehicles , which places the bogies (often Jacobs bogies ) under the connection between the carriages or wagons. Most bogies have two axles, but some cars designed for heavy loads have more axles per bogie. Heavy-duty cars may have more than two bogies using span bolsters to equalize
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