The British Railways Class 24 mixed traffic diesel locomotives, also known as the Sulzer Type 2, were built from 1958 to 1961. One hundred and fifty-one were built at Derby, Crewe and Darlington, the first twenty of them as part of the British Railways 1955 Modernisation Plan. This class was used as the basis for the development of the Class 25 locomotives.

The final survivor, no. 24081, was withdrawn from Crewe depot in 1980, now all examples preserved