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Type and origin
Power type Diesel-electric
Builder MotivePower Ind.
Model MP21B
Build date 2008 (2008) – Present
Total produced 1
Gauge 4 ft 8 12 in (1,435 mm)
Prime mover Cummins QSK19C (×3)
Engine type Straight-six engine
Aspiration Turbocharger
Cylinders I6 (×3)
Performance figures
Power output 2,100 hp (1,570 kW)
Operators Amtrak[1]

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,[2] currently operated by Amtrak.[1]


  1. ^ a b "Amtrak & Amtrak California (AMTR & CDTX)". Green Rail News. Retrieved 7 October 2010. 
  2. ^ MPE-X Low Emissions Locomotives

External links[edit]

  • Genset Locomotive Rosters – Information and resource site for low-emission switcher locomotives built by Motive Power Industries.