Reasons For Use
The reasons railroads ordered B units included the fact that a B unit was slightly cheaper. With no driving cab, B units lack windshields, crew seats, radios, heating, and air conditioning. There would also be no toilets, which were usually found in the short hood of an A unit. In the early days of dieselization, there was also no argument from the railroad unions that a B unit deserved a second crew; this was a major point of contention for a while. Additionally, at first, railroads bought multiple-unit diesel locomotives as one-for-one replacements for steam locomotives; as a result, railroads could not take advantage of the flexibility afforded by interchangeable units, which could be assembled into any required power output. When a three- or four-unit locomotive was considered an indivisible unit, there was no point in the intermediate units having cabs. Finally, B units gave a smoother line to the train for passenger service.
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