The Class 121s were a fleet of 16 1car multiple units, which operated on the branches off the Great Western Main Line featured in the Thames Valley branches route as well as similar branch lines in Cornwall and Norfolk. What's included with this pack? Class 121 in BR Blue Grey and GWR 150 livery The Class 121s would mostly work on the branch lines on this route, but would make occasional appearances paired with 101s on mainline services. The BR Blue/Grey 121 would also layer into Diesel Legends of GWE on the Greenford branch workings to/from Paddington as well as 2 diagrams between Reading and Paddington paired with a Class 101 Class 43 'HST' in Intercity Executive livery This livery would be AI only and be a reskin of the MML HST, as the VP185 engines sound closer to a Valenta than the MTU engines. The timetable for this route would be set in 1985, just before the takeover of Network SouthEast livery. Mainline AI layers Class 37/5 (Tees): Tanker workings Class 47 (JT): Container, Coal and Aggregates workings as well as XC and GWML loco hauled services (Mk1s and Mk2s). Class 101 (Any owned): Mainline local services