Early General Motors Electro-Motive Division switchers were built with Winton 201-A engines. A total of 175 were built between February 1935 and January 1939. Two main series of locomotives were built, distinguished by engine size and output: the straight-8, 600 hp (450 kW) 'S' series, and the V12, 900 hp (670 kW) 'N' series. Both were offered with either one-piece cast underframes from General Steel Castings of Granite City, Illinois, denoted by 'C' after the power identifier, and fabricated, welded underframes built by EMD themselves, denoted by 'W'. This gave four model series: SC, SW, NC and NW. Further developments of the 900 hp (670 kW) models gave model numbers NC1, NC2, NW1, and NW1A, all of which were practically indistinguishable externally from the others, as well as a pair of unique NW4 models for the Missouri Pacific Railroad and a solitary, twin-engined T transfer locomotive model built for the Illinois Central Railroad.
600 hp (450 kW) S series
The production S series locomotives are identical except for cast or welded underframes, which are identical to those used under the N-series 900 hp (670 kW) locomotives. The hood on the S series is shorter, and the locomotives have a characteristic, rounded-edged "satchel" in front of the radiator. The straight-8 600 hp (450 kW) Winton 201-A engine moved the exhaust stacks off-center to the engineer's left, while the N series' were central. The Winton-engined switchers can be distinguished from later EMD 567-engined units by small louvres at the top front sides of their hoods, as well as top-of-hood ventilation through several lifting vents rather than the large top grille of those later units.
The 600 hp (450 kW) series was much more successful than the 900 hp (670 kW) during this early period; 114 were sold.
Pre-SC
Two pre-production units were built in February 1935; they differed from full production units by having a hood that did not taper in toward the cab, and six rather than three small louvres on each top front hood side. They were built as EMD S/N 516 and 517 and were delivered to the Delaware, Lackawanna and Western Railroad as their #425 and 426. One, #426, survives on the Genesee Valley Railroad in Lackawanna colors. It has been re-engined with an EMD 567 engine.
没有评论:
发表评论