The 662 was built by Baldwin in Eddystone, PA in 1946. The engine was one of three diesel-electrics (along with the 661 and 663) placed in service on December 2, 1946. These three first-generation diesel locomotives completely transitioned the Chesapeake Western from steam to diesel power. The diesels’ projected cost per mile of $.25 compared very favorably to the line’s steam locomotives which operated at $.96 per mile (both exclusive of wages).