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The "C" designation stood for cast frame locomotives and the "W" designation for welded frame locomotives. EMC standardized on welded frames after 1939. The "TR" designation stood for transfer locomotives. The SC and SW switchers were the first locomotives produced in EMC's new factory after its completion in 1936.
EMD arrived at the name SW1 based on the locomotive's power (S for 600 hp) and frame design (W for welded), and the number 1 was added to distinguish the new design from the previous EMD SW. [1] As new and more powerful SW designs emerged in the 1950s, the SW name evolved to instead stand for "switcher." [1]
The 900 hp (670 kW) V12 Winton 201-A-engined NC and NW series locomotives can be distinguished from the less powerful 600 hp (450 kW) SC and SW because, although the underframes are identical, the hood on the N series is longer, leaving only a small amount of room before the front walkway. Many, but not all, N series locomotives have a short ...
The EMD SW9 is a model of diesel switcher locomotives built by General Motors Electro-Motive Division between November 1950 and December 1953. Additional SW9s were built by General Motors Diesel in London Ontario Canada from December 1950 to March 1953.
The EMD SW1001 is a 1,000-horsepower (750 kW) diesel switcher locomotive built by General Motors' Electro-Motive Division between September 1968 and June 1986. [1] A total of 230 were constructed, mainly for North American railroads and industrial operations.
An EMD SW1200 is a four-axle diesel switcher locomotive built by General Motors Electro-Motive Division between January 1954 and May 1966. [1] Power is provided by an EMD 567C 12-cylinder engine, which generates 1,200 horsepower (890 kW).
2174 was the one of the last steam locomotives to be withdrawn in the USA. Y7: 2-8-8-2 - - Never built 0 - Never built Never built [2] Z1: 2-6-6-2: 1300–1314: Alco-Richmond: 1912: 10: 0: 1934: Z1a: 2-6-6-2: 1315–1489: Alco-Richmond, Baldwin: 1912–1918: 175: 0: 1934–1958: 1331–1489 rebuilt to Z1b, 1399 rebuilt to Z2 Steam turbine ...
Units rebuilt from SW or SC model locomotives developed 600 or 660 horsepower with the older generators instead of the full 900 horsepower of the SW900. [citation needed] In the early 1960s, the Reading Company sent 14 of their Baldwin VO 1000 model switchers to EMD to have them rebuilt to SW900 specifications. The Reading units retained the ...