A diesel multiple unit or DMU is a multiple-unit train powered by on-board diesel engines. A DMU requires no separate locomotive, as the engines are incorporated into one or more of the carriages. Diesel-powered single-unit railcars are also generally classed as DMUs. Diesel-powered units may be further classified by their transmission type: diesel–mechanical DMMU, diesel–hydraulic DHMU, or diesel–electric DEMU.
The InterCity 225 is an electric push-pull high speed train in the United Kingdom, comprising a Class 91 electric locomotive, nine Mark 4 coaches and a Driving Van Trailer (DVT). The Class 91 locomotives were built by British Rail Engineering Limited's Crewe Works as a spin-off from the Advanced Passenger Train project, which was abandoned during the 1980s, whilst the coaches and DVT were constructed by Metro-Cammell in Birmingham and Breda in Italy, again borrowing heavily from the Advanced Passenger Train. The trains were designed to operate at up to 140 mph (225 km/h) in regular service, but are limited to 125 mph (200 km/h) principally due to a lack of cab signalling and the limitations of the current overhead line equipment. They were introduced into service between 1989 and 1991 for intercity services on the East Coast Main Line (ECML) from London King's Cross to Leeds, York and Edinburgh.
The British Rail Mark 4 is a class of passenger carriages built for use in InterCity 225 sets on the East Coast Main Line between King's Cross, Leeds and Edinburgh. Withdrawals began in 2019, with some being sold for further use with Transport for Wales between Cardiff and Holyhead.
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.
Diesel multiple units and railcars are trains, usually with passenger accommodation, that do not require a locomotive. Railcars can be single cars, while in multiple units cars are marshalled together with a driving position either end. As of December 2010, 23 percent of the rail passenger cars used on Network Rail are part of a diesel multiple unit.
The British Rail Class 800, branded as the Intercity Express Train (IET) by Great Western Railway (GWR) and Azuma by London North Eastern Railway (LNER) is a type of bi-mode multiple unit train built by Hitachi Rail for GWR and LNER. The type uses electric motors powered from overhead electric wires for traction, but also has diesel generators to enable trains to operate on unelectrified track. It is a part of the Hitachi AT300 product family.
The British Rail Class 801 Azuma is a class of electric multiple unit (EMU) built by Hitachi Rail for London North Eastern Railway. The units have been built since 2017 at Hitachi's Newton Aycliffe Manufacturing Facility and have been used on services on the East Coast Main Line since 16 September 2019. As part of its production, the Class 801 units were ordered as part of the Intercity Express Programme and are in the Hitachi AT300 product family, alongside the closely related Class 800 units. LNER have branded the units as the Azuma, just like on their Class 800 units.
The CAF Civity is a family of regional passenger trains which is manufactured by Spanish rolling stock manufacturer Construcciones y Auxiliar de Ferrocarriles. Available as both diesel, electric and battery-electric multiple unit, the Civity was first launched in 2010 and received its first order two years later.
The British Rail Class 331 Civity is a class of electric multiple unit built by CAF, owned by Eversholt Rail Group, and currently operated by Northern Trains. A total of 43 units have been built – 31 three-car units and 12 four-car units. Construction of the trains started in July 2017 and they were phased into service from 1 July 2019.
The British Rail Class 195 is a class of diesel multiple-unit passenger train from the Civity family manufactured by CAF, owned by Eversholt Rail Group and currently operated by Northern Trains. A total of 58 units have been built; 25 two-car units and 33 three-car units. The class is almost identical to the Class 331 also produced by CAF, which is the electric version of the Class 195, differing only in traction type and vehicle formation.
The British Rail Class 397 Civity is a class of electric multiple unit built by Spanish rolling stock manufacturer CAF for lease to TransPennine Express by Eversholt Rail Group. A total of twelve five-car units were built to operate services on TransPennine North West services between Liverpool Lime Street/Manchester Airport and Edinburgh Waverley/Glasgow Central.
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 755 FLIRT is a class of bi-mode multiple unit passenger train built by Stadler Rail for Greater Anglia. Part of the FLIRT modular train family, the trains first entered service on 29 July 2019 and are used on regional and local services throughout East Anglia, as well as some intercity services between Norwich and London.
The British Rail Class 745 FLIRT is a class of electric multiple unit passenger train, built by Stadler as part of the FLIRT family. The class is built for Greater Anglia for use on their inter-city services and the Stansted Express services. They first entered service on 8 January 2020, after being constructed between 2018 and 2020 in Switzerland.
London North Eastern Railway (LNER) is a British train operating company which operates most services on the East Coast Main Line. It is owned by DfT Operator for the Department for Transport (DfT). The company's name echoes that of the London and North Eastern Railway, one of the Big Four railway companies which operated between 1923 and 1948.
The British Rail Class 196 Civity is a class of diesel multiple unit built for West Midlands Trains by Spanish rolling stock manufacturer CAF. A total of 26 units have been built; 12 two-car units and 14 four-car units.
The British Rail Class 197 is a class of diesel multiple unit passenger train built by CAF, based on its Civity platform. They are operated by Transport for Wales Rail (TfW), split into 51 two-car units and 26 three-car units.
The British Rail Class 231 is a class of eleven diesel-electric multiple units of the FLIRT family, which have been built for Transport for Wales by Swiss rolling stock manufacturer Stadler Rail. The first units entered service on 18 January 2023.
The British Rail Class 756 FLIRT is a class of tri-mode multiple units 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 also carry batteries as an additional source of traction power.
Transport for Wales Rail Limited, branded as Transport for Wales and TfW Rail, is a Welsh publicly owned train operating company, a subsidiary of Transport for Wales (TfW), a Welsh Government-owned company. It commenced operations of the day to day services of the Wales & Borders franchise on 7 February 2021, as an operator of last resort, succeeding KeolisAmey Wales.
