HORNBY OO BR - MK1 Corridor - S15036 - Composite CoachHORNBY 1 76 BR MK1 CORRIDOR S15036 COMPOSITE COACH Description The BR Mk1 coach was the first standardised carriage design introduced by British Railways, with thousands built between 1951 and 1963 at key works including Derby, Wolverton, Doncaster, York, Eastleigh and Swindon. Designed to replace a wide variety of pre nationalisation rolling stock, the Mk1 quickly became a familiar and essential part of railway operations across all regions.