SECR Maunsell D1 Class SECR Grey 4-4-0 Steam Locomotive No.735 (DCC Sound)Exclusive Model, Produced by Dapol. Brief History: After 1901 the D class locomotive fast became the mainline locomotive of choice on the south coast, (making the SE&CRs first mainline express formation) further (for the time) powerful locomotives were investigated by the companies. After Richard Maunsell took the reigns from Harry Wainwright in 1913 he worked on a series of new locomotives which were intended for a long service life, this involved