British Rail Class 206

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British Rail Class 206
Tadpole unit at guildford.jpg
Class 206 3R unit at Guildford, June 1979
In service1964 – early 1990s
Number built6
Operator(s)British Rail
Maximum speedunknown
Prime mover(s)English Electric 4-cylinder type 4SRKT Mark II of 500 bhp at 850 rpm

The British Rail Class 206 or 3R was a type of diesel-electric multiple unit (DEMU) first created in 1964. They were re-formed from Class 201 and Class 416 vehicles for use on Reading-Redhill-Tonbridge (North Downs Line) services. Six three-car sets were created, numbered 1201–1206. They were nicknamed 'Tadpole' units because of the contrast between the wide-bodied 416 'head' and the narrow-bodied 206 'tail'.