These cars were the first of the Comet series, built by Pullman Standard in 1970–73 for the New Jersey Department of Transportation and used the Erie-Lackawanna Railroad's diesel-hauled commuter services. These were considered state of the art at the time, due to their all-aluminum body shell construction as well as their use of head-end power (HEP). Their automated entrance doors, designed for use with low platforms only, earned them the nickname "Sliders". 155 cars were built, with 35 cab cars, 110 trailer coaches and 10 bar cars.