The new design was equipped with inside and outside sets of Walschaerts valve gear, therefore reducing the mechanical complexity that had plagued his previous designs, and these powered 6' wheels [REF].
After a period of 17 years in both primary and secondary passenger duties, Richard Maunsell, who became Chief Mechanical Engineer of the newly formed Southern Railway in 1923, decided that as the class did not to conform with the general standardization of Southern locomotive classes it should be withdrawn [REF].