features incorporated into the Mark 3, such as new seating, plastic interior panelling, and floor-sensor-operated automatic gangway doors. Unlike Mark 1 coaches, built by a wide range of manufacturers, both BR workshops and private builders, all production Mark 2 (and Mark 3) coaches were built on a single assembly line at the BR carriage works at Derby. Manchester Pullman Mark 2 carriages were used on the Manchester Pullman service from 1966 until withdrawal in 1985. These luxuriously appointed first class carriages had several unusual features, such as inward opening doors and some interior walnut panelling. Only 29 carriages were built. The livery was pearl grey with blue window surrounds, a reversal of the standard British Rail blue and grey livery of the late 1960s and 1970s. A Liverpool Pullman service was also operated, using the same type of carriages, until 1974. Current uses As of May 2020, Mark 2 coaches are still in use on some services on the UK rail network. Network Rail operate Mark 2s as brake force carriages on its test trains. Riviera Trains and West Coast Railways both operate Mark 2s on charters; many of the former's are still painted in Anglia Railways and Virgin Trains liveries. Multiple units based on the Mark 2 Unlike the many Mark 1 multiple units and the numerous Mark 3 multiple units that followed, few multiple unit classes were based on the Mark 2 bodyshell. Most were electric multiple units with British Railways, and which operated under AC using overhead wires. The first of these were Class AM10 in 1966 operating commuter services from London Euston and in the West Midlands. The introduction of TOPS saw these units reclassified Class 310. The other type was Class 312, a derivative of, and almost identical to, the Class 310, introduced in 1975, primarily used on commuter services from London King's Cross and London Liverpool Street, the last slam-door multiple units built for British Railways. Northern Ireland Railways used the Mark 2 bodyshell as the basis for the 80 Class DEMU, which entered service in 1974. Thirteen 5 car electric multiple units were built in 1976 for Taiwan (and withdrawn in 2009): the Taiwan Railway EMU100 series. Sales to other rail operators Northern Ireland Railways and Iarnród Éireann purchased various types from new, and a number of ex-BR vehicles have been sold for further use outside Great Britain and abroad. Electric Multiple Units