DMU Engines

Rolls Royce C8 238hp Engine

There were two types of Rolls Royce engine used in DMUs, both from their C range, the six-cylinder C6 (180hp) and the eight-cylinder C8 (238hp).

The image shows the C8 engine with a torque converter fitted to the left side.

These DMUs were fitted with the C8 engines:

• E50000 part of a Derby twin set with hydraulic transmission
• Class 112 Cravens power-twins with mechanical transmission
• Class 113 Cravens power-twins with hydraulic transmission
• Class 125 Derby triples with hydraulic transmission
• Class 127 Derby quads with hydraulic transmission

The Cravens vehicles had one engine per power car, the others had two.

On Blue Pullman sets the current for lighting, air-conditioning, refrigeration, battery-charging and ancillary equipment was supplied by two underfloor mounted generating sets, each set comprising an 8-cylinder Rolls Royce C8N horizontal engine directly coupled to a Stones Tonum alternator.