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 in 1923. They were based on the earlier GCR Class 11E "Director" class (LNER D10).
Quick Facts GCR Class 11F LNER Class D11, Type and origin ...
GCR Class 11F LNER Class D11 |
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GCR Class 11F 62690 (LNER D11/2 No. 6397) The Lady of the Lake at Haymarket MPD, Edinburgh, in 1958 |
Type and origin |
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Power type | Steam |
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Designer | John G. Robinson |
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Builder | |
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Build date | 1919–1924 |
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Total produced | 35 |
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Specifications |
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Configuration:
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• Whyte | 4-4-0 |
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• UIC | 2′B h2 |
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Gauge | 4 ft 8+1⁄2 in (1,435 mm) standard gauge |
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Leading dia. | 3 ft 6 in (1.067 m) |
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Driver dia. | 6 ft 9 in (2.057 m) |
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Length | 56 ft 5.5 in (17.209 m) |
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Loco weight | 61.15 long tons (62.13 t; 68.49 short tons) |
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Tender weight | 48.30 long tons (49.08 t; 54.10 short tons) |
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Fuel type | Coal |
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Fuel capacity | 6 long tons 0 cwt (13,400 lb or 6.1 t) |
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Water cap. | 4,000 imp gal (18,000 L; 4,800 US gal) |
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Firebox: | |
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• Grate area | 26.5 sq ft (2.46 m2) |
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Boiler:
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• Diameter | 5 ft 0.5 in (1,537 mm) to 5 ft 3 in (1,600 mm) |
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Boiler pressure | 180 psi (1.24 MPa) |
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Heating surface: | |
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• Firebox | 155 sq ft (14.4 m2) |
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• Tubes | 972 sq ft (90.3 m2) |
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• Flues | 416 sq ft (38.6 m2) |
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• Total surface | 1,543 sq ft (143.3 m2) |
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Superheater:
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• Heating area | 209 sq ft (19.4 m2) |
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Cylinders | Two, inside |
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Cylinder size | 20 in × 26 in (508 mm × 660 mm) |
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Valve gear | Stephenson |
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Valve type | 10 inches (254 mm) piston valves |
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Career |
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Operators | |
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Class | - GCR: 11F
- LNER: D11/1, D11/2
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Power class | BR: 3P2F |
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Withdrawn | 1958–1962 |
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Disposition | One preserved, remainder scrapped |
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Close
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.[2]