London Midland and Scottish Railway (LMS) Stanier Class 5 4-6-0 No. 5110 (British Railways no. 45110) is a preserved British steam locomotive. It has carried the name RAF Biggin Hill in preservation, though it never carried this in service.
5110 was built in 1935 by the Vulcan Foundry. She was built with a low-degree superheat domeless boiler. It still carries a domeless boiler. It was one of three members of the class to haul the Fifteen Guinea Special, British Railways last steam-hauled passenger train, on August 11, 1968. It was then preserved, and has since been based on the Severn Valley Railway.
Currently on static display at Barrow Hill Roundhouse for under cover storage, due to stay for at least two years on loan from the Severn Valley Railway.
During 2010, the tender of 45110 was recalled back to the SVR for use behind LMS Stanier Mogul 42968 after the 2-6-0's previous fowler tender developed wheelflats. 45110's tender is due to stay at the line until 2012 when 42968 is taken out of service.