Officially the fastest diesel trains in the world, the High-Speed Trains were introduced by British Rail in 1976, operating 125mph services on the Great Western Main Line and the East Coast Main Line before being introduced to other lines later.

When originally built by BREL at Crewe Works, the InterCity 125 units consisting of a pair of Class 43 power units and a rake of Mk3 coaches, were considered to be diesel multiple units and allocated as Class 253 to the Western Region and Class 254 for the Eastern Region, as it was envisaged that the sets would remain in fixed formation.

At the beginning of April 2006, FirstGroup, having secured the newly combined Greater Western franchise, unveiled a proposed new livery with a graduated blue to purple body colour and horizontal dynamic lines. Originally applied to both coaching stock and power cars, upon refurbishment the power cars received a modified livery of solid blue/purple, minus the dynamic lines

This train pack features representations of power cars No. 43087 '11 Explosive Ordnance Disposal Regiment Royal Logistics Corps' and No.43098 in First Great Western plain blue livery.