They were able to operate over most of the Southern Railway network, gaining the nickname "U-Boats" after the submarine warfare of the First World War, and continued to operate with British Railways (BR).
They were able to operate over most of the Southern Railway network, gaining the nickname "U-Boats" after the submarine warfare of the First World War. The class earned a good reputation amongst locomotive crews on the long runs between Salisbury and Exeter, and continued to operate with British Railways (BR).