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Petrol-electric transmission
Petrol-electric transmission (UK English) or Gasoline-electric or Gas-electric transmission (US English) is a transmission system for road, rail and marine transport which avoids the need for a gearbox. The petrol engine drives a dynamo which supplies electricity to traction motors which propel the vehicle or boat. The traction motors may be driven directly or, in the case of a submarine, via a rechargeable battery.
Petrol-electric transmission was used in certain niche markets in the early 20th century. For example in the petrol-electric railway locomotives produced in Britain for use on the War Department Light Railways during World War I. In France, the Crochat petrol-electric transmission system was used for standard gauge locomotives (up to 240kW of electrical power).
After World War I, petrol-electric transmission was largely replaced by diesel-electric transmission but, in the 21st century, it is making a comeback in hybrid electric vehicles.
==Advantages and disadvantages==
Petrol-electric transmission allows smooth, stepless, acceleration without gear changes. The disadvantages are increased cost and weight.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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