Twelve motor carriages (DMBSO), numbered 51–62, and sixteen trailers (TSO), numbered 71–86, were built. Trains were formed of various formations, from a single motor carriage, to pairs of motor cars with up to three intermediate trailers. They were originally classified Class 453 under TOPS but were later reclassified Class 487. One vehicle, DMBSO no. 61, was initially stored at the National Railway Museum in York, before being subsequently transferred to the London Transport Museum's Acton Depot. The Class 487 was transferred to London Transport Museum in Covent Garden.