Baldwin S-12

The Baldwin S-12, also written BLH S12, was a 1,200 horsepower diesel-electric switcher locomotive with a turbocharged six-cylinder version of the 606A diesel prime mover, known for its lugging power despite being temperamental. Like most Baldwin-Lima-Hamilton switchers it had AAR Type-A switcher trucks in a B-B wheel arrangement. A total of 451 units were built between 1951 and 1956, when BLH left the locomotive market. It was the last in a line of Baldwin switchers that began with the VO-660 and VO-1000 and passed through the DS-4-4-660 and DS-4-4-1000, and turbocharged models always had one large exhaust stack offset to the side.