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Director Class Butler Henderson
Power type Steam
Designer John G. Robinson
Builder Great Central Railway (11) Kitson & Co. (12) Armstrong Whitworth (12)
Build date 1919–1924
Total produced 35
Specifications
Configuration 4-4-0
UIC classification 2′B h2
Gauge 4 ft 8 1⁄2 in (1,435 mm)
Leading wheel diameter 3 ft 6 in (1.067 m)
Driver diameter 6 ft 9 in (2.057 m)
Locomotive weight 61.15 long tons (62.13 t)
Tender weight 48.30 long tons (49.08 t)
Fuel type Coal
Boiler pressure 180 psi (1.24 MPa)
Firegrate area 26.5 sq ft (2.46 m2)
Superheater area 209 sq ft (19.4 m2)
CylindersTwo, inside
Cylinder size 20 in × 26 in (508 mm × 660 mm)
Valve gear Stephenson
Valve type 10 inches (254 mm) piston valves
Performance figures
Tractive effort 19,645 lbf (87.4 kN)
Career
Operator(s) Great Central Railway
→ London and North Eastern Railway
→ British Railways
Class
GCR: 11F
LNER: D11/1, D11/2
Power class BR: 3P2F
Disposition One preserved, remainder scrapped
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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).
There were two subclasses: D11/1 were the original GCR engines and D11/2 were those built in 1924 by the LNER to a reduced loading gauge with smaller boiler mountings for hauling passenger trains in Scotland.