Diesel Locomotives, 1940-1969

The earliest diesel-era photo in my collection is this photo of Wisconsin Central F3 A-B-A set 2200 at the Electro-Motive plant in LaGrange, Illinois in 1948. This is actually the EMD builder's photo of the 2200. The 2200 would later be nicknamed the "Queen Mary" by crews, no doubt a reference to the immense length of the units as compared to even the longest steam locomotives, the 5000-series O-20 class 4-8-4s. The 2200 operated for some time as a coupled A-B-A set, but eventually the units were separated and used independently across the system, at which time they acquired A, B and C subletters. (C was assigned to the B unit, for reasons beyond explanation here).