close

Sign In


Not registered?
Forgot Your Password?

DMU Technology


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.