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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