loco-info.com - MPI MP8AC-3

OL929 in February 2019 at Gowanus/Park Slope, Brooklyn, New York City

Tdorante10 CC BY-SA: Attribution-ShareAlike

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.

General
Built	2012-2013
Manufacturer	MotivePower
Axle config	B-B
Gauge	4 ft 8 1/2 in (Standard gauge)

Dimensions and Weights
Length	53 ft 3 1/4 in
Wheelbase	36 ft
Service weight	116,000 lbs
Adhesive weight	116,000 lbs
Axle load	29,000 lbs

Boiler

Boiler

Power Plant

Power Plant

Power
Power source	diesel-electric
Top speed	30 mph
Starting effort	20,250 lbf
Engine	Cummins QSK 23G
Engine type	6-cyl. diesel
Fuel	500 us gal (diesel)
Engine output	860 hp (641 kW)

Calculated Values
Factor of adhesion	1 : 5.73
Power-to-weight ratio	0.0074 hp/lb
Adhesive weight/Total	1 : 1.00

diesel locomotive

switcher

three-phase AC

last changed: 12/2023

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