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In page Hybrid vehicle:
"Since these engines typically need extra weight for traction purposes anyway the battery pack's weight is a negligible penalty.[citation needed] The diesel generator and batteries are normally built on an existing "retired" "yard" locomotive's frame. The existing motors and running gear are all rebuilt and reused. Fuel savings of 40–60% and up to 80% pollution reductions are claimed over a "typical" older switching/yard engine. The advantages hybrid cars have for frequent starts and stops and idle periods apply to typical switching yard use.[5] "Green Goat" locomotives have been purchased by Canadian Pacific, BNSF, Kansas City Southern Railway and Union Pacific among others.
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