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A diesel locomotive is a type of railway locomotive in which the power source is a diesel engine. Several types of diesel locomotives have been developed, differing mainly in the means by which mechanical power is conveyed to the driving wheels. The most common are diesel-electric locomotives and diesel-hydraulic.
An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or on-board energy storage such as a battery or a supercapacitor. Locomotives with on-board fuelled prime movers, such as diesel engines or gas turbines, are classed as diesel-electric or gas turbine-electric and not as electric locomotives, because the electric generator/motor combination serves only as a power transmission system.
The British Rail Class 73 is a British electro-diesel locomotive. The type is unusual in that it can operate from the Southern Region's 650/750 V DC third-rail or an on-board diesel engine to allow it to operate on non-electrified routes. This makes it very versatile, although the diesel engine produces less power than is available from the third-rail supply so the locomotives are rarely operated outside of the former Southern Region of British Rail. It is one of the first bi-mode locomotives ever built. Following the withdrawal and scrapping of the more powerful Class 74 bi-mode locomotives in 1977, the Class 73 was unique on the British railway network until the introduction of the Class 88 bi-mode locomotives in 2017. Ten locomotives have been scrapped.
An electro-diesel locomotive is a type of locomotive that can be powered either from an electricity supply or by using the onboard diesel engine. For the most part, these locomotives are built to serve regional, niche markets with a very specific purpose.
The British Rail Class 56 is a type of diesel locomotive designed for heavy freight work. It is a Type 5 locomotive, with a Ruston-Paxman power unit developing 3,250 bhp, and has a Co-Co wheel arrangement. Enthusiasts nicknamed them "Gridirons", due to the grid-like horn cover on the locomotive's cab ends fitted to nos. 56056 onwards. Under its Romanian railway factory nomenclature, the locomotive was named Electroputere LDE 3500, with LDE coming from Locomotivă Diesel-Electrică and the 3500 being the planned horsepower output.
Railway electric traction describes the various types of locomotive and multiple units that are used on electrification systems around the world.
GB Railfreight (GBRf) is a rail freight company in the United Kingdom. As of 2022, it is owned by the global investment company Infracapital, itself a subsidiary of M&G plc, a UK investment group.
The British Rail Class 88 is a type of mainline mixed traffic electro-diesel locomotive manufactured by Stadler Rail for Direct Rail Services (DRS) in the United Kingdom. The locomotive is part of the Stadler Euro Dual family. It is the first dual-mode locomotive in the UK to use the 25 kV AC electrification.
The Stadler Euro is a class of diesel-electric locomotives built by Stadler Rail for the European market. It is available in two basic variants, the four-axle Euro 3000, and the six-axle Euro 4000. These locomotives are powered by EMD 710 prime movers. A six-axle electric-only variant is marketed as Euro 6000; it is also built for the Iberian gauge.
The Bombardier ALP-45DP is a type of single cab dual-mode locomotive operated by New Jersey Transit and Exo. The locomotive was designed and originally built by Bombardier, which was bought by Alstom, which will complete the second order of locomotives.
The Stadler Eurolight is the brand name for a family of 4-axle Bo'Bo' mainline diesel-electric locomotives with sub-20-tonne axleloads for passenger and freight trains produced by Stadler Rail.
The Class 68 is a type of mainline mixed traffic diesel-electric locomotive manufactured by Stadler Rail for Direct Rail Services (DRS) in the United Kingdom. The design is derived from the Stadler Eurolight, and Stadler's product name for this variant is the UKLight.
The Stadler Euro-Dual is a series of dual power, electro-diesel locomotive by Stadler Rail Valencia. Unlike traditional dual mode locomotives, fitted with relatively low-powered diesel engines for 'last mile' movements only, vehicles are typically furnished with power units more comparable to that of mainline diesel locomotives.
Beacon Rail is a rolling stock company (ROSCO) based in the United Kingdom. Its primary business is the leasing of locomotives and rolling stock to various train operating companies (TOCs).
An electro-diesel multiple unit (EDMU) or bi-mode multiple unit (BMU) is a form of a multiple unit train that can be powered either by electric power picked up from the overhead lines or third rail or by using an onboard diesel engine, driving an electric generator, which produces alternating current (AC) or direct current (DC) electric power.
The British Rail Class 769 Flex is a class of bi-mode multiple unit (BMU) converted by Brush Traction, and running in service with Northern Trains. The train is a conversion of the existing Class 319 electric multiple unit (EMU), a conventional unit type which had become surplus to requirements during the 2010s.
UK Rail Leasing (UKRL) is a railway company offering locomotive leasing and rolling stock engineering services to various train operating companies. It is based in Leicester.
The British Rail Class 93 is a tri-mode locomotive built by Stadler Rail in Valencia. It is an evolution of the Class 88 bi-mode locomotive which was built by Stadler for Direct Rail Services. Three different power sources are used to power the locomotive – 4,000 kW (5,400 hp) 25 kV AC overhead electric power, or a 900 kW (1,200 hp) diesel engine supplemented by a 400 kW (540 hp) battery – allowing the locomotive to be used on both electrified and non-electrified lines.
The British Rail Class 756 FLIRT is a class of tri-mode multiple units being built for Transport for Wales Rail by Swiss rolling stock manufacturer Stadler Rail. They are closely related to the Class 755 bi-mode units delivered by Stadler to Greater Anglia between 2018 and 2020, which can be powered either by overhead electric lines or on-board diesel generators. The Class 756 units will also carry batteries as an additional source of traction power.
The Indian locomotive class WDAP-5 is a class of diesel-electric dual mode locomotive that was developed in 2019 by Banaras Locomotive Works (BLW), Varanasi for Indian Railways. The model name stands for broad gauge (W), Diesel (D), AC Current (A), Passenger (P) and 5000 Horsepower (5). The locomotive can deliver 6120 hp in electric mode and 4500 hp in diesel mode. It is under development as of 2023.
References
- 1 2 GBRf orders 30 Stadler Class 99 bi-mode locos Modern Railways 29 April 2022
- ↑ "Our people: Leadership Teams: President". THE INSTITUTION FOR RAIL INFRASTRUCTURE ENGINEERING. Retrieved 2 August 2023.
- ↑ Peter Dearman (21 December 2022). "The Future role of rail: A strategic freight network". RailEngineer. Rail Engineer Magazine. Retrieved 26 February 2023.
Bi-mode locomotives have the flexibility to take power from the wires or diesel fuel. Yet they have limited spaced for an engine due to their electric traction equipment. It is understood that the recently ordered Class 99 bi-mode locomotives will only be able to deliver 1,600kW at the rail.
- ↑ "GBRf orders Stadler bi-mode Class 99 locomotives". Railnews . Retrieved 29 April 2022.
- ↑ "Stadler Class 99 bi-mode Co'Co' locomotive being introduced to UK in deal with Beacon Rail and GBRf". RailBusinessDaily. 29 April 2022. Retrieved 29 April 2022.
- ↑ Clinnick, R. (June 2023). "Stadler to maintain Class 99s at Leicester". Headline News. Rail Express. No. 325. Horncastle: Mortons Media Group. p. 12. ISSN 1362-234X.
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