GCR Class 11F

The Great Central Railway Class 11F, also called the Improved Director class, was a class of 4-4-0 steam locomotives designed by John G. Robinson for passenger work. The London and North Eastern Railway reclassified them as Class D11 in 1923. They descended from the earlier Class 11E Director engines and came in two subclasses: D11/1, the original Great Central engines, and D11/2, built by the LNER in 1924 with a reduced loading gauge and smaller boiler mountings for services in Scotland. Their 6 ft 9 inch driving wheels made them fast but unsuited to freight. The eleven original engines were withdrawn in 1959 and 1960 and the last Scottish D11/2 in January 1962; No. 506 Butler-Henderson is preserved in the National Collection. Armstrong Whitworth built twelve of the class.