A total 769 units of the SW1200 Bo-Bo type switcher were built by EMD, and 287 were produced by the associate of EMD in Canada, General Motors Canada, between 1954 and 1966. The RS denoted large front and rear (on some units) numberboard housings, EMD Flexicoil B-B trucks, and larger fuel tanks for road-switcher service. Of the 297, the majority, 208, went to Canadian National.
The prime mover was a V12 567C diesel engine with a 1200 hp output.
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