After nationalisation in 1948 British Railways added 40000 to their numbers so they became 43835–44026.

Five engines were constructed by Armstrong Whitworth for the Somerset and Dorset Joint Railway in 1922, numbered 57–61.

The 197 engines in this class were withdrawn between 1954 and 1965 as follows: One Midland-built 4F, (4)3924 is preserved on the Keighley and Worth Valley Railway, the first locomotive to leave Woodham Brothers scrapyard in Barry, South Wales in September 1968.

Hornby introduced a OO gauge model of 3924 in 2022 to celebrate the film "Return of the Railway Children" which featured this locomotive.

This article relating to steam locomotives operated in the United Kingdom is a stub.