The turbine was designed to operate into a maximum back-pressure of 2 psi (14 kPa), allowing a conventional double blast-pipe to provide the boiler draught, and eliminating draught fans, which always seemed to give a disproportionate amount of trouble.

One disadvantage of the design was that the small reverse turbine only had sufficient power for manoeuvring "light engine" and the locomotive always had to be turned to face forwards in order to pull a train.

When a turbine failure occurred in 1949, it was considered uneconomic to repair, due to post-war austerity measures, so the locomotive was taken out of service pending a rebuild.

46202 was rebuilt as a conventional locomotive in 1952, using new mainframes and a set of cylinders of the same type as used in the "Coronation" Class,[4] and named Princess Anne.

[5] On 8 October 1952, after only two months in service, while hauling an express train bound for Liverpool Lime Street, it was involved in the Harrow and Wealdstone rail crash.