In 1941 and 1942 a total of four double locomotives of the Type D 311 were put into service by the German Wehrmacht. They had been built for transporting heavy rail protection. Two locomotives, the V 188 001 a/b and the V 188 002 a/b were continued to be used by the German Federal Railways after the war. A third locomotive served as a spare part donor. They proved themselves in the heavy goods train and sliding service, mainly on the spessart ramp. After a generator failure, the V 188 001 had to be shut down as early as 1968. V 188 002, later 288 002 was still in operation in the Franconian region until 1972. In 1973, both machines were scrapped.This text is machine translated.