The B Unit Era
B units were commonly built in the cab unit days in the 1930s, 1940s and 1950s. When hood unit road switchers became the common kind of diesel locomotive, some B units were built, but many railroads soon came to the opinion that the lower cost of a B unit did not offset the lack of operational flexibility. Few B units have been built in the last 40 years. Railroads that kept ordering B units longer than most were largely Western roads, including the Union Pacific, Burlington Northern, and the Santa Fe. Santa Fe ordered the GP60B model in 1991, which were the final B units built for road service in North America as of 2005.
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