"Epoch IIIa" version in green paint with roof superstructure.
Frame panels with 4 sandboxes each Cab and engine room lighting installed; switchable in digital operation / In 1941 and 1942, a total of four type D 311 double locomotives were put into service by the German Wehrmacht. They were built for the transport of heavy railway guns. Two locomotives, the V 188 001 a/b and the V 188 002 a/b, continued to be used by the German Federal Railway after the war. A third locomotive served as a spare parts donor. They proved themselves in heavy goods train and pushing service, mainly on the Spessart ramp. After generator damage, V 188 001 had to be withdrawn as early as 1968. V 188 002, later 288 002 was still in service in the Franconian region until 1972. In 1973, both machines were scrapped."