what is it?
The MPI MP21B is a low-emissions diesel switcher locomotive built by MotivePower. 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 was manufactured, currently operated by Amtrak.
who runs it
base stats
Bars compare against all trains: 600 km/h (maglev), 1,700 seats; power, weight and number built on a log scale up to 20 MW, 1,000 t and 20,000 built.
fun facts
- First built 18 years ago, in 2008.
- 1.6 MW is about 18 family cars (~85 kW each) flat out.
diesel locomotive: A diesel engine on board drives the wheels, usually through a generator (diesel-electric).
spec sheet
- built
- 2008
- number built
- 1
- kind
- Diesel-electric
- traction
- diesel
- origin
- 🇺🇸 United States
- builders
- MotivePower
- operators
- Amtrak
- top speed
- —
- power
- 1.6 MW
- gauge
- 1,435 mm standard gauge
From the Wikipedia infobox and Wikidata. Blank means the sources don't say.
Sources: Wikidata Q6717291, Wikipedia: MPI MP21B (CC BY-SA 4.0).Updated 2026-10-25.