Class 127 Derby 4-car DMUs

Introduced: 1959
Coupling code: Blue Square (later Red Triangle)
Underframe: 64ft 6in
Engines: Rolls Royce 238hp
Transmission: Hydraulic

Thirty of these sets were built, each formed of two x DMBS, one TS and one TSL. They were high density sets with no gangway connections, with seats for 352 2nd class passengers, later reduced to 348. Rarely venturing from the intensively worked St. Pancras to Bedford line, this earned them the name Bed-Pan units.

Built with a blue square control system, problems with driver errors when coupled to gearbox units meant the vehicles were reclassified as red triangle units.

They lasted in passenger service on the line until electrification in 1983 when the power cars were withdrawn, with a good few going into parcels use. A lot of the trailers were transferred to Tyseley and lasted would another ten years.