Diesel 5705

D5705 is a green mixed-traffic diesel engine. He has a brother named BoCo.

Annuals
When Bill and Ben's nameplates have been removed to be cleaned, the twins pretended they were each other. BoCo got confused, but got back at Bill and Ben by pretending to be his twin, D5705, who he named CoBo.

Basis
D5705 is based on the real British Rail (BR) Class 28 Co-Bo diesel-electric engine of the same number. While all the other Class 28s were withdrawn and scrapped, D5705 survived by a historical accident as a technical services engine and then carriage heating unit TDB968006 before being preserved in 1980. The Class 15 Preservation Society has signed an agreement with the owners of D5705 to become its custodians during its restoration and operation for the next decade, although funding will remain separate. D5705 is currently preserved and under restoration at the East Lancashire Railway.

Livery
D5705 is painted in the BR Deep Bronze green livery. He has yellow warning panels on his front and back end. "D5705" is painted on the left side of his cab in white.

Appearances
Railway Series=

Companion volumes
Other Media=
 * 1987 - The Island of Sodor: Its People, History and Railways
 * 1999 - Thomas the Tank Engine: The Complete Collection
 * 2005 - Sodor: Reading Between the Lines

Annuals

 * 1986 - Annual
 * 1987 - Annual
 * 1999 - Bill and Ben

Trivia

 * During Days Out with Thomas events, D5705 is given a face to resemble BoCo.