- Electric multiple unit
An electric multiple unit or EMU is a
multiple unittrain consisting of many carriages using electricityas the motive power.
The cars that form a complete EMU set can usually be separated by function into four types: power car, motor car, driving car, and trailer car. Each car can have more than one function, such as a motor-driving car or power-driving car.
* A power car carries the necessary equipment to draw power from the electrified infrastructure, such as shoes for
third railsystems and pantograph for overhead linessystems, and transformers.
* Motor cars carry the
traction motorto move the train.
* Driving cars are similar to a cab car, containing a driver's cab for controlling the train. An EMU consist usually of two driving cars, resulting in only one driver's cab at each end of the train.
* Trailer cars are any car that carry no traction or power related equipments, and are similar to passenger cars in a locomotive-hauled train.
Some of the more famous electric multiple units in the world are high speed trains: the
Shinkansenin Japanand ICE 3 in Germany. Metro-North outside of New York is also famous for its M1Cosmpolitans, M2Metropolitans, and its newer M7s and M8s.
EMUs are also popular on commuter and suburban rail networks around the world due to their fast acceleration, pollution-free operation and quietness. Being quieter than DMU and
locomotive-drawn trains, EMUs can operate later at night and more frequently without disturbing residents living near the railway lines. In addition, tunnel design for EMU trains is simpler as provisions do not need to be made for diesel exhaust fumes.
BelgianEMU AM80" Break" unit.
British SWT Class 450 suburban unit at London Waterloo Station.
British Class 390 in
Birmingham New Street, in Virgin Trainslivery.
British Class 334 "Juniper" EMU at Gourock in Scotland.
Transperth B Series EMUs operate in Perth,
Class 323 EMU departs
Longbridgein the United Kingdom. New Delhi MetroEMU in India. SEPTAEMUs near Paoli, PA, USA. Russian EMU ED4MKM unit.
JR East Type E233-1000 EMU test run
ShinkansenType 500 EMU. Russian EMU ER2K604 unit.
* Air brake
* Railway brakes
Diesel multiple unit
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