Hybrid Locomotive is a locomotive or multiple unit train that uses an on-board rechargeable energy storage system (RESS) (battery or ultracapacitors) and a fueled power source for propulsion.
Hybrid trains typically are powered either by fuel cell technology or the more conventional diesel-electric hybrid which reduces fuel consumption through regenerative braking and switching off the hydrocarbon engine when idling or stationary (as used in automobiles such as the Toyota Prius).
Energy used by train operations makes up approximately 70% of all energy consumed by railroad companies, so reduction of this not only provides environmental benefits but economic advantages as well.
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