GCR Class 11F

GCR Class 11F
LNER Class D11
GCR Class 11F 62690 (LNER D11/2 No. 6397) The Lady of the Lake at Haymarket MPD, Edinburgh, in 1958
Type and origin
Power typeSteam
DesignerJohn G. Robinson
Builder
Build date1919–1924
Total produced35
Specifications
Configuration:
 • Whyte4-4-0
 • UIC2′B h2
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Leading dia.3 ft 6 in (1.067 m)
Driver dia.6 ft 9 in (2.057 m)
Length56 ft 5.5 in (17.209 m)
Loco weight61.15 long tons (62.13 t; 68.49 short tons)
Tender weight48.30 long tons (49.08 t; 54.10 short tons)
Fuel typeCoal
Fuel capacity6 long tons 0 cwt (13,400 lb or 6.1 t)
Water cap.4,000 imp gal (18,000 L; 4,800 US gal)
Firebox:
 • Grate area26.5 sq ft (2.46 m2)
Boiler:
 • Diameter5 ft 0.5 in (1,537 mm) to 5 ft 3 in (1,600 mm)
Boiler pressure180 psi (1.24 MPa)
Heating surface:
 • Firebox155 sq ft (14.4 m2)[1]
 • Tubes972 sq ft (90.3 m2)[1]
 • Flues416 sq ft (38.6 m2)[1]
 • Total surface1,543 sq ft (143.3 m2)[1]
Superheater:
 • Heating area209 sq ft (19.4 m2)
CylindersTwo, inside
Cylinder size20 in × 26 in (508 mm × 660 mm)
Valve gearStephenson
Valve type10 inches (254 mm) piston valves
Performance figures
Tractive effort19,645 lbf (87.4 kN)
Career
Operators
Class
  • GCR: 11F
  • LNER: D11/1, D11/2
Power classBR: 3P2F
Withdrawn1958–1962
DispositionOne preserved, remainder scrapped

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).

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]

  1. ^ a b c d Boddy et al. 1981, p. 86.
  2. ^ Marsden, Richard. "The Robinson Class D11 (GCR Class 11F) 'Improved Director' 4-4-0 Locomotives". www.lner.info. Retrieved 28 January 2019.