31120 and originally Diesel 5538, was a diesel owned by the Other Railway.
31120 was built by Brush Traction in 1959, and originally carried the number 5538. He/she was later present to take Gordon's passengers at Barrow-in-Furness, after his/her fiery experience when a puncture dampened Gordon's fire and narrowly avoided overheating. 31120 was later retired from service in August 1991, and scrapped the following year.
31120 is based on a BR Class 31, hence his/her number. D701 is another member of this class. Around 26 locomotives had been purchased and preserved for use on many heritage railways around the UK.
31120 was painted in British Rail "Rail Blue" livery with large yellow warning panels.
- 31120's headcode is "1X01", which is odd, as the "X" indicates "Royal Train" or "out-of-gauge load".