Battery electric multiple unit

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A battery electric multiple unit (BEMU), battery electric railcar or accumulator railcar is an electric multiple unit or railcar whose energy can be supplied from rechargeable batteries driving the traction motors. Prime advantages of these vehicles is that they do not use fossil fuels such as coal or diesel fuel, emit no exhaust gases and do not require the railway to have expensive continuous infrastructure like electric third rail or overhead catenary. On the down side is the weight of the batteries, which raises the vehicle weight, affecting the range before recharging of between 300 and 600 kilometres (186 and 373 mi). Currently, battery electric units have a higher purchase price and running costs than petrol or diesel railcars. One or more charging stations are required along the routes they operate, unless operation is on a mixture of electrified and unelectrified track, with the batteries being charged from the electrified track. Battery technology has greatly improved since the...

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