Here is a MTH 20-2200-1 O Gauge PRR Centipede AA Diesel Engine Set #5823 with PS1. These engines are models of the famous Baldwin Centipede Diesel, which was designed as a high speed passenger locomotive but ended up being used as helper engines to assist PRR's freight trains over the Allegheny Mountains. This engine set features two protosmoke units in each A unit, two remote controlled protocouplers on each set, two precision flywheel equipped motors in each A unit, and Protosounds 1.0.
