The LSWR O2 class is a class of 0-4-4T steam locomotive designed for the LWSR by William Adams. Sixty were constructed during the late nineteenth century. They were also the last steam engines to work on the Isle of Wight, with the final two being withdrawn in 1967.

A total of 23 locomotives were sent over to the Isle of Wight between 1923 and 1949, two examples, numbers W24 Calbourne and W31 Chale, were retained to work engineers' trains during the electrification of the surviving Ryde–Shanklin line. Both were withdrawn on completion of the electrification project in March 1967. These two locomotives, survived long enough to enter preservation.