The MPI MP21B is a low-emissions diesel switcher locomotive built by MotivePower Industries. It is powered by three Cummins QSK19C I6 engines with each one developing 700 horsepower (522 kW) and creating a total power output of 2,100 horsepower (1,570 kW). One MP21B locomotive has been produced to date,[1] currently operated by Amtrak.[2]
- Genset Locomotive Rosters – Information and resource site for low-emission switcher locomotives built by Motive Power Industries.
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| Four-axle freight |
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| Six-axle freight |
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| Passenger |
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| Railcars |
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| Diesel locomotives |
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| Dual-mode locomotive |
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| Electric locomotives |
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| Switchers |
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| Former locomotives |
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Diesel
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Dual Mode
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Electric
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Gas Turbine
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Diesel Switchers
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