A total of 282 carriages were built, to maintain a fleet of 30 fixed formations Each one comprised of nine vehicles, operating with a Class 91 locomotive and a Driving Van Trailer on the other end to allow trains to operate in both directions without needing to turn the locomotive The Mk4 is an all-steel design which incorporates a number of improvements over the previous Mk3s Most notably, the inclusion of automatic push-button operated plug-type doors in place of the manually-operated slam doors The body shells, which were built by BREL and Breda in Milan, also have fully sealed gangways and controlled emission toilets (CETs)
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