This F7 dummy B unit locomotive is painted blue with black band and yellow stripes. It was built in 1949 by the Electro-Motive Division of General Motors. The EMD F7 was a 1,500 horsepower (1,100 kW) Diesel-electric locomotive produced between February 1949 and December 1953 by the Electro-Motive Division of General Motors (EMD) and General Motors Diesel (GMD). 1,483 cabless booster or B-units were built. Many F7s remained in service for decades, as railroads found them economical to operate and maintain.