The LNER Class V2 2-6-2 steam locomotive, number 4771 Green Arrow was built in June 1936 for the London and North Eastern Railway (LNER) at Doncaster Works to a design of Nigel Gresley. The first-built and only surviving member of its class, it was designed for hauling express freight and passenger trains and named after an express freight service.The locomotive was initially allotted the number 637, and fitted with curved nameplates over the middle driving wheels.