MPI MP21B

Performance figures
Power output	2,100 hp (1,570 kW)

Career
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]

References

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

Low emissions locomotives

Altoona Works	BP4 GP33ECO

Brandt Road-Rail	Prototype

Brookville Equipment	BL12CG BL14CG BL20CG BL20G BL20GH BL36PH

Electro-Motive Diesel	F125 GP15D GP20D GP22ECO GT38ACe SD22ECO SD32ECO SD70ACe SD70M-2

GE Transportation Systems	ES40DC ES44AC ES44C4 ES44DC

MotivePower, Inc.	MP14B MP20B MP20C MP21B MP36PH-3C MP36PH-3S MP40PH-3C HSP46

National Railway Equipment	1GS7B 2GS14B 3GS21B 3GS21C 2GS36C-DE

Progress Rail Services	PR15B PR22B PR30C PR43C

Railpower Technologies	GGS2000D GG10B GG20B GK10B RP14BD RP20BH RP20BD RP20CD RP27CD

Siemens Mobility	Siemens Charger

See also: List of low emissions locomotives

Locomotives built by Morrison-Knudsen (MK Rail), Boise Locomotive, MotivePower Industries, and Wabtec

Four-axle freight	MK Rail MK1200G MPI MP8AC-3 MPI MP14B MPI MP1500 MPI MP20B MPI MP2000D MPI MP21B

Six-axle freight	MK Rail MK5000C MPI MP20C MPI MP27CN MPI MP33CN MPI MP33C

Passenger	BART C2 Cars (EMU) MPI MP36PH-3S MPI MP36PH-3C MPI MP40PH-3C MPI HSP46

Railcars/Trainsets

Diesel locomotives

Dual-Mode locomotives

Electric locomotives

Work locomotives

Former locomotives

Diesel	EMD E8 / E9 EMD F3B / F7 / FP7 EMD SDP40F GE P30CH EMD F40PH / F40PHR EMD F69PHAC Bombardier LRC (trainset) Budd RDC (DMU)

Dual-Mode	EMD FL9

Electric	PRR GG1 GE E60 EMD AEM-7 Bombardier HHP-8

Gas Turbine	UAC TurboTrain (trainset) ANF/Rohr Turboliner (trainset)

Work locomotives	ALCO RS-1 / RS-3 ALCO S-2 EMD CF7 EMD GP7 / GP9 EMD GP40 EMD SSB1200 EMD SW8 GE 45t / 65t Railpower GG20B PRR E44 (electric)

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