Gunga Din is the nickname of a particular standard motorcycle built by the Vincent HRD company at their factory in Stevenage, Hertfordshire, England. The bike was first assembled in 1947 as a Series B Rapide. It came to fill two roles; one of only two factory-backed racing bikes and a development platform for Vincent's high-performance V-twin models. Gunga Din underwent extensive modification throughout its working life until it was abandoned at the factory in the mid-1950s. Rediscovered in 1960, the bike was not restored until 2009.