above the cab, leading to the nickname "Skinheads". These pilot scheme locomotives were non-standard in having Electro-Magnetic Multiple-Working control equipment, and were limited to 80 mi/h. After being involved in a serious collision D5518 was rebuilt in September 1967 as a standard locomotive, with indicator boxes, and blue star coupling code.

They were allocated to East Anglian sheds throughout their service, ending up allocated to Stratford, their initial