The Midland Railway 3835 Class is a class of 0-6-0 steam locomotive designed for freight work. The first two were introduced in 1911 by Henry Fowler. After the grouping in 1923 they continued to be built up to 1941 by the LMS as the LMS Fowler Class 4F.

A total of 197 engines were built. 192 of them were sequentially numbered 3835–4026 for the Midland Railway. 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. They were absorbed into LMS stock in 1930, becoming 4557–4561.

One Midland-built 4F, (4)3924 is preserved, the first locomotive to leave Woodham Brothers scrapyard in Barry, South Wales in September 1968. Three LMS-built 4Fs have also been preserved.