Pre-Owned Class 158 2-Car DMU 158711 ScotRail Saltire - DCC SoundPre Owned Item, in as new condition. Accessory pack and instructions included. Test Run. The Class 158 is one of British Rails most successful second generation Diesel Multiple Units (DMUs); first introduced in 1989, all but one of the original units remain in traffic to this day. This all new Graham Farish model follows in the footsteps of the brands award winning Class 319 Electric Multiple Unit and captures this iconic prototype to a tee. The