 The majority of the Canadian National and Canadian Pacific SW1200 fleets were purchased as SW1200RS units.The Sandersville Railroad Company EMD SW1200 road number SAN 1200, formerly SAN 200, was originally built with the V-12 EMD 567C prime mover, but it was replaced with a V-12 EMD 645 prime mover.The two both produce , even though the same motor in the EMD SW1500 produces .