251, GNR Ivatt Atlantic 4-4-2

A preserved GNR C1 Large Atlantic 4-4-2 express passenger locomotive, built at Doncaster Works in 1902 as the class prototype — the first of H. A. Ivatt's large-boilered Atlantics that replaced the Stirling Singles on GNR East Coast express duties and in turn were succeeded by Gresley's Pacifics. Preserved as part of the National Collection and displayed at the National Railway Museum.

No. 251 represents a crucial transition in British locomotive history — the shift from the single-driver express engines of the Victorian era to the multi-coupled Atlantics and Pacifics of the Edwardian and interwar periods. The large boiler introduced by Ivatt established the precedent that Gresley followed in designing the A1 and A3 Pacifics that produced Flying Scotsman and Mallard.

On loan to the Danum Gallery, Library and Museum, Doncaster, where it has been displayed since January 2021. It remains part of the National Collection and is still owned by the National Railway Museum. Operating status: Static display. Current livery: GNR apple green.

Location, livery and operating status last confirmed pre-2024 and subject to change. Check with the owning organisation or heritage railway for current information.