The reference for locomotives and railcars
Metropolitan Transportation Authority class R156
United States | 2012 | 28 produced
OL929 in February 2019 at Gowanus/Park Slope, Brooklyn, New York City
OL929 in February 2019 at Gowanus/Park Slope, Brooklyn, New York City

The MP8AC-3 is a diesel-electric locomotive built by MotivePower, Inc for the New York City subway. Right from the basic concept, it was developed as a work train locomotive for this operator. The model name here stands for 800 hp and AC drive.

Since the third rail is generally switched off during work, an electric drive was completely dispensed with. Instead, in addition to the 800 hp main diesel, a second, smaller one is used, which is used to generate electricity when stationary. The bogies are the same from Kawasaki as on the R160 class subway trains and use the same three-phase traction motors from Siemens.

Axle configB-B 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length53 ft 3 1/4 in
Wheelbase36 ft
Service weight116,000 lbs
Adhesive weight116,000 lbs
Axle load29,000 lbs
Power sourcediesel-electric
Top speed30 mph
Starting effort20,250 lbf
EngineCummins QSK 23G
Engine type6-cyl. diesel
Fuel500 us gal (diesel)
Engine output860 hp (641 kW)
Power Plant
Calculated Values
diesel locomotive
three-phase AC
last changed: 12/2023

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