Following on from the Mk3 coach, the Mk4s were built between 1989 and 1992 at Metro-Cammell’s Washwood Heath facility for the newly-electrified InterCity 225 services on the East Coast Main Line.

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).

This RailRoad model coach is a durable replica of a First Class Open coach in BR InterCity livery.