This video from oorail.com describes the Class 121 Diesel Single-Car Driving Motor Vehicle which is featured here in Network Southeast Livery - Thames. This model is from Hornby R2508A and is DCC Ready. While the Class 121 were built in the 1960s, this version is in Network Southeast Livery, it would be suitable to run on a layout modeling 1986 to the end of the British Rail era (ca. 1997).