What is a DMU and how does it work?. Read the introduction to what a DMU is and the basics on the power train, control system and other parts.
Another great introduction to how DMUs work are the many staff training manuals.
More detailed information on different components:
Engines: | Introduction; AEC 220; Leyland - 600, 680, Albion; Rolls Royce - C6, C8; 1950s overhauls |
Gearboxes: | Introduction; D173 gearbox; R14 gearbox; SE4 gearbox |
Drive Train: | Fluid flywheel; Freewheel; Cardan shafts; Bogies |
Radiators | Hydrostatic (experimental) |
Protection | Drivers Safety Device; AWS |
Vacuum Brakes | Description; Operation; Exhauster; Automatic Feed Valve; Overhauling Feed Valves; Automatic Isolating Valve; Overhauling Isolating Valves; Brake Cylinder; Direct Admission Valve; Drivers Brake Valve |
Electrics: | Batteries; Fuses; Wiring; Dynamos and Alternators |
Controls: | Coupling codes; Electrical Systems; Blue Square; Yellow Diamond; Gear controller overhaul |
Air System: | Unloader Valve; Throttle Motor; Wipers; Compressors; |
Auxiliaries: | Heaters |
There is a section containing technical documentation.
Servicing your DMU? A list of common consumables.
Equipment - what components were fitted to what cars when new?
50001 - 50394
50395 - 50987
51008 - 51680
51681 - 55999
79008 - 79901
Many of the mechanical components for DMUs were supplied by British United Traction (B.U.T.). This was a joint venture between Leyland and A.E.C.