The Delaware-Lackawanna's big Century 636, at the moment of startup, emanating a typical Alco-like burst of thick, black smoke. The 3642 was built in April of 1968 as the Penn Central No. 6342.
Don Colangelo, retired CMO (and sometimes piano player) at the DL Scranton shops cared for the many ALCOs, MLWs and a few EMDs that passed in and out of South Scranton and Von Storch shop doors.
Here is a look and many of those units.