page_title: Hybrid train
section_title: Railpower
hierarchical_section_title: Hybrid train / Development / North America / Railpower
caption_attribution_description: RailPower Technologies "Green Goat" hybrid switching locomotive.
context_page_description: A hybrid train is a locomotive, railcar or train that uses an onboard rechargeable energy storage system, placed between the power source 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 and transmission is direct mechanical, electric or hydrostatic.
  Diesel electric locomotives may have most of what they need for regenerative braking since they might already use dynamic braking.
context_section_description: In 2004, Railpower Technologies, a Canadian company, began running pilots in the United States with the Green Goat shunting locomotives. The trials led to orders by the Union Pacific and Canadian Pacific Railways, starting in early 2005. These diesel-electric hybrid trains are expected to cut emissions by up to 90 percent and to decrease fuel consumption by up to sixty percent, when compared to conventional diesel-powered locomotives. The "Green Goat" locomotives were intended to be used in marshalling yards.
caption: A Green Goat hybrid shunting locomotive
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