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. 