R40497 Mk3 TRSB Trailer Buffet Virgin 40437Expected Delivery Q4 2026 Q1 2027 (Subject to Change at Manufacturer's Discretion). British Rail introduced the production version of the Mk3 coach in 1975 with improved standards of comfort in response to competition from airlines and increased use of private motor cars. Designed and built by BREL, they were initially intended as locomotive hauled stock, but with the development of the High Speed Train (HST), were soon adapted for use at speeds of up