Built in 1962 as D5840.
Renumbered into the TOPS series as 31307 in 1973.
Rebuilt as class 31/4 and renumbered 31449 in 1984.
Renumbered to 31549 in ????.
31549 at Peterborough 1990s31549 at Tinsley Depot 199431549 at Toton Depot 1997