Class 127 Derby 4-car sets

Thirty of these sets were built, each formed of 2xDMBS, TS and 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.

They lasted in passenger service on the line until electrification in '83 when the power cars were withdrawn, although a good few went into parcels use. A lot of trailers were transferred to Tysley and lasted another ten years.

Eight power cars and two trailers are preserved.