due to bomb damage. The interiors were modernised with bus-type seating. Driving motor coach 28221 was fitted with a germanium rectifier and displayed at the International Railway Congress, Willesden, London between 26 and 29 May 1954. Formations Unit numbers were not allocated, but sets were referred to by the last two digits of the DMBSO number. The numbers of individual carriages were: See also MR electric units Morecambe branch line References Books 100 Years of Electric Traction by Colin J Marsden, published by Oxford Publishing Company in 1985, AM1 6600 V AC electric multiple units Train-related introductions in 1952