Erected in 1954 as the Milwaukee Road's 2051, this EMD SW1200 switcher had been renumbered to 603 by the time I took this transparency at Mason City, Iowa in July 1973. In the Milwaukee's 1985 merger into the Soo Line it was renumbered to 1206 but was sold to Dakota Rail the following year, retaining its number. Subsequently it was transferred to the Twin Cities & Western, where it is still in service.