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Battery electric multiple unit ：ウィキペディア英語版

Battery electric multiple unit

A battery electric multiple unit, battery electric railcar or accumulator railcar is an electrically driven multiple unit or railcar whose energy is derived from rechargeable batteries that drive its traction motors.
The main advantage of these vehicles is their clean, quiet operation. They do not use fossil fuels like coal or diesel fuel, emit no exhaust gases and do not require the railway to have expensive infrastructure like electric ground rails or overhead catenary. On the down side is the weight of the batteries, which raises the vehicle weight, and their range before recharging of between 300 and 600 kilometres. Battery electric units have a higher purchase price and running cost than petrol or diesel railcars and need a network of charging stations along the routes they work.
Battery technology has greatly improved over the past 20 years broadening the scope of use of battery trains, moving away from limited niche applications. Despite higher purchase and running costs, on certain railway lines battery trains are economically viable as the very high cost and maintenance of full line electrification is eliminated. From March 2014 a passenger battery train has been in operation in Japan. Britain successfully trialled fare paying passenger hybrid overhead wire/lithium battery trains in January and February 2015.
==History==
Experiments with accumulator railcars, as they were originally called, were conducted from around 1890 in Belgium, France, Germany and Italy. In the USA, railcars of the ''Edison-Beach'' type, with nickel-iron batteries were used from 1911. In New Zealand, a battery-electric Edison railcar operated from 1926 to 1934. The Drumm nickel-zinc battery was used on four 2-car sets between 1932 and 1946 on the Harcourt Street Line in Ireland and British Railways used lead-acid batteries in a railcar in 1958. Between 1955 and 1995 DB railways successfully operated 232 DB Class ETA 150 railcars utilising lead-acid batteries.

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