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A hybrid train is a locomotive, railcar or train that uses an onboard rechargeable energy storage system (RESS), placed between the power source (often a diesel engine prime mover) and the traction transmission system connected to the wheels. Since most diesel locomotives are diesel-electric, they have all the components of a series hybrid transmission except the storage battery, making this a relatively simple prospect. Surplus energy from the power source, or energy derived from regenerative braking, charges the storage system. During acceleration, stored energy is directed to the transmission system, boosting that available from the main power source. In existing designs, the storage system can be electric traction batteries, or a flywheel. The energy source is diesel, liquefied petroleum gas, or hydrogen (for fuel cells) and transmission is direct mechanical, electric or . Diesel electric locomotives have high potential for energy savings when using dynamic braking, which use the traction motors as generators to stop the train. Without a way to recover and store the braking energy, these engines currently have no option other than to transfer it into the atmosphere as heat, using large electric heating elements and high velocity cooling fans. Using a storage system means that a non-fully electric train can use dynamic braking, and even shut down the main power source whilst idling or stationary. Reducing energy consumption provides environmental benefits and economic savings. A smaller scale version of the concept is found in hybrid automobiles, such as the chevy volt. ==Development== The hybrid train was conceived, under a slightly different name, mixed drive train, at the turn of twentieth century. Pieper system was applied to Belgian (Vicinal tramway) and French (Compagnie des Chemins de Fer de Grande Banlieue) railcars as soon as 1911.〔 (La Nature, 1921 )〕〔 (Bulletin de la société d'encouragement pour l'industrie nationale, 1924 )〕 Thomas transmission, which is similar in design to the mechanical part of the Hybrid Synergy Drive, was used in the United Kingdom and tested in New Zealand in a NZR RM class railcar.〔(The Motoring World, 28 July 1915 ) in ''The Straits Times''.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「hybrid train」の詳細全文を読む スポンサード リンク
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