Builder: BR Derby Works
Type: High Density
Coupling Code: Blue Square / Red Triangle
Coupling Type: Screw
Gangway Type: None
Engines: Rolls Royce 238hp
Lot Number: 30521
51635 - original number
55970 - from May-85 (parcels conversion)
Derby works built Rolls Royce, hydraulic DMU (leading car M51635) enters Harpenden on the 15th September 1979 as it had done for many years, but as can be seen the wind of change is arriving with the first of the overhead masts being in place. 54A South Dock.
DMBS M51635 leads a pair of class 127 4-car units at St.Pancras waiting to work another service to Bedford. Saturday 22nd January 1983 Iain Reid.
ADB977191, 915 M55975 + M55985, M55969+M55968, 914 M55980 + M55984 and 911 M55970 + M55971 at Crewe Basford Hall on 24-9-89. Kevin Dowd.