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The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951. [2] It was powered by a 1,200 horsepower (895 kW)12-567A engine. [1] The SW7 replaced the earlier 1,000 horsepower NW2 switcher in EMD's catalog. [3] A total of 489 SW7 locomotives were produced.
A total of 1,502 S-2s were built from August 1940 to June 1950; 797 S-4s were built from June 1949 to August 1957. The S-4 was first produced in Canada, with ALCO production beginning in June 1949. The S-2 and S-4 were designed as rail yard switchers, meant to replace older, less efficient, and more demanding steam switchers.
This was the standard light switcher locomotive of the USRA types, and was of 0-6-0 wheel arrangement in the Whyte notation, or "C" in UIC classification. A total of 255 locomotives were built under USRA control; these were sent to the following railroads:
Model Build date Total produced Wheel arrangement Prime mover Power output Image 60-ton: 1924–1928: 26: B-B: Ingersoll-Rand 10 in × 12 in (254 mm × 305 mm): 300 hp (220 kW) 100-ton
Chicago & North Western's railroad manual estimated that the SD60 is 3% more fuel efficient than one SD50, while a pair of SD60s was up to 16% more efficient than three SD40s pulling a standard coal train. [1] Norfolk Southern has been modernizing their old SD60s since 2010 into SD60Es, a model specific to NS. [2]
The SW1200 was the third model of 1,200 hp SW series switchers built by EMD. It was a successor to the SW7 and SW9.Compared to its direct predecessor, the SW9, the SW1200 differed in that it used the improved and more reliable 567C engine, compared to the SW9's 567B engine.
3 Road switchers. 4 Transfer units. 5 Cab units. 6 See also. ... Model designation Build year ... 3 B-B VO 900 hp (671 kW) Pre VO-600 1939 2
Only 96 units were built for American railroads, as few firms saw sufficient value in moving freight in greater quantities or at a higher speeds than was possible with the typical 1,500 and 1,600 horsepower (1,200 kW) four-axle road switchers of the era. Also limiting the model's utility as a true road unit was its lack of a short hood, which ...