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.
A multiple-unit train is a self-propelled train composed of one or more carriages joined, and where one or more of the carriages have the means of propulsion built in. By contrast, a locomotive-hauled train has all of the carriages unpowered.
A railbus is a lightweight passenger railcar with an automotive engine. It shares many aspects of its construction with a bus, typically having a bus body and four wheels on a fixed base instead of on bogies. Originally designed and developed during the 1930s, railbuses have evolved into larger dimensions with characteristics similar in appearance to a light railcar, with the terms railcar and railbus often used interchangeably. Railbuses designed for use specifically on little-used railway lines were commonly employed in countries such as Germany, Italy, France, the United Kingdom, and Sweden.
The British Rail Class 104 diesel multiple units were built by Birmingham Railway Carriage and Wagon Company from 1957 to 1959.
The British Rail Classes 101 and 102 diesel-mechanical multiple units were built by Metro-Cammell at Washwood Heath in Birmingham, England, from 1956 to 1959, following construction of a series of prototype units. These classes proved to be some of the most successful and longest-lived of BR's First Generation DMUs, second in longevity only to the Class 121, with the final five units being withdrawn on 24 December 2003. The oldest set was, by then, just over 47 years old.
In rail transport, head-end power (HEP), also known as electric train supply (ETS), is the electrical power distribution system on a passenger train. The power source, usually a locomotive at the front or 'head' of a train, provides the electricity used for heating, lighting, electrical and other 'hotel' needs. The maritime equivalent is hotel electric power. A successful attempt by the London, Brighton and South Coast Railway in October 1881 to light the passenger cars on the London to Brighton route heralded the beginning of using electricity to light trains in the world.
The Endeavour Railcars are a class of diesel multiple units (DMU) operated by NSW Trainlink on its intercity passenger rail services in New South Wales, Australia on the Hunter, Blue Mountains, Southern Highlands and South Coast lines. They are mechanically identical to the Xplorers, but are fitted out for shorter travel distances. All 30 carriages were built by ABB's Dandenong rolling stock factory.
Push–pull is a configuration for locomotive-hauled trains, allowing them to be driven from either end of the train, whether having a locomotive at each end or not.
A control car, cab car, control trailer, or driving trailer is a non-powered rail vehicle from which a train can be operated. As dedicated vehicles or regular passenger cars, they have one or two driver compartments with all the controls and gauges required to remotely operate the locomotive, including exterior locomotive equipment such as horns, bells, ploughs, and lights. They also have communications and safety systems such as GSM-R or European Train Control System (ETCS). Control cars enable push-pull operation when located on the end of a train opposite its locomotive by allowing the train to reverse direction at a terminus without moving the locomotive or turning the train around.
The 900/800 class railcars were diesel multiple units built by the New South Wales Government Railways between November 1951 and November 1960.
Locomotives and train sets of Sri Lanka Railways consist mostly of diesel locomotives and multiple units. Steam locomotives are no longer used, except on heritage trains such as the Viceroy Special.
Sri Lanka Railways S11 is a class of Diesel-electric multiple unit (DEMU) train set built for Sri Lanka Railways by Integral Coach Factory, India and imported through RITES Ltd, an Indian state infrastructure corporation on a line of credit extended by the Indian Government. They were built to replace locomotive-hauled passenger trains. Twenty S11 DEMUs were ordered to strengthen long-distance travel on the Coastal Line from Colombo to Matara.
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.
Sri Lanka Railways S12 is a class of Diesel-electric multiple unit (DEMU) built for Sri Lanka Railways by China's CSR Corporation. The first batch arrived in Sri Lanka in August 2012. They were built to replace locomotive-hauled passenger trains. Seven of the S12 DMUs were ordered to strengthen long-distance travel on the Main line from Colombo to Badulla. Four of S12s were built to serve the Kelani Valley Line. The remaining set was designed as a luxury train.
Sri Lanka Railways S8 is a class of Diesel multiple unit (DMU) train set made by Hitachi and Hyundai operated by Sri Lanka Railways. They were imported to Sri Lanka in 1991 and primarily runs on the Kelani Valley Line.
Sri Lanka Railways Class M3 was a class of Diesel-electric locomotive that was created in 1955 by the Ceylon Government Railway to be used on the Ceylon national rail network.
Sri Lanka Railways S10 is a class of Diesel-electric multiple unit (DEMU) train set built for Sri Lanka Railways by China South Locomotive & Rolling Stock Corporation and imported in 2008. Fifteen S10 DEMUs were ordered to strengthen commuter services on crucial commuter lines.
The Sri Lanka Railways Class W1 is a class of Sri Lankan diesel hydraulic locomotive that was built by Rheinstahl Henschel in 1969. A total of 45 W1s were built and imported. This is the first diesel-hydraulic locomotive which ran on Sri Lankan rail.
Ceylon Government RailwayS1 was a class of Diesel multiple unit train sets built by English Electric for the Ceylon Government Railway.
The Indian locomotive class WDM-3D is a class of diesel–electric locomotive that was developed in 2003 by Banaras Locomotive Works (BLW), Varanasi for Indian Railways. The model name stands for broad gauge (W), Diesel (D), Mixed traffic (M) engine with 3300 horsepower (3D). The engine is classified WDM-3D though it outputs only 3300 hp and not 3400 hp as the name should suggest. They entered service in 2003. A total of 590+ WDM-3D were built at Banaras Locomotive Works (BLW), Varanasi between 2003 and 2016.
