 A full 20 engines (including the newest of the fleet, DD 1052) were scrapped in 1929 as newer K and N class locomotives took over branch line goods services and Petrol Electric Rail Motors started to replace mixed trains and locomotive-hauled branch line passenger services.The unrebuilt saturated steam D1 class locomotives were the first to go, and by 1951 no fewer than 120 had been scrapped.By 1951, the remaining D1 locomotives were shunters, the D2 locomotives providing suburban goods and branch line goods and passenger service, and the D3 performing both branch line and mainline service.