DRS Mk1 Restaurant BuffetHOR R40027 Hornby DRS, Mk1 Restaurant Buffet, 1657 Era 11 The first standardised railway carriage design built by British Railways, the Mark 1 coach introduced in 1951 could be found across Britain's railway network and continued to be produced until 1963, and even later in the form of multiple units and non passenger stock. Along with being widely deployed, Mk1 coaches were built in various places including Derby, Doncaster, Eastleigh, Swindon,