The Great Central Railway Class 11F or Improved Director Class is a class of 4-4-0 steam locomotive designed by John G. Robinson for passenger work. The LNER classified them as Class D11 from 1923. They were based on the earlier GCR Class 11E "Director" class (LNER D10).
GCR 506 BUTLER-HENDERSON became LNER 5506 or 2660 and was subsequently numbered British Railways locomotive 61660
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