GER Class L77

The GER Class L77, LNER Class N7, is a class of 0-6-2T steam locomotives. They were designed by Alfred John Hill of the Great Eastern Railway and introduced in 1915. The design was perpetuated by Nigel Gresley of the LNER after the 1923 grouping. 134 were built and one example is preserved.

GER Class L77
LNER Class N7
N7/1 on a suburban train for Brentwood, c.1927
Type and origin
Power typeSteam
DesignerA. J. Hill
Builder
Build date1915–1928
Total produced134
Specifications
Configuration:
  Whyte0-6-2T
  UICC1 h2t
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Driver dia.4 ft 10 in (1.473 m)
Trailing dia.3 ft 9 in (1.143 m)
Wheelbase23 ft 0 in (7.01 m)
Length34 ft 10 in (10.62 m) over buffers
Axle load16 long tons 3 cwt (36,200 lb or 16.4 t)
Adhesive weight49 long tons 4 cwt (110,200 lb or 50 t)
Loco weight61.8–64.85 long tons (62.79–65.89 t)
Fuel typeCoal
Fuel capacity3 long tons 5 cwt (7,300 lb or 3.3 t)
Water cap.1,600 imperial gallons (7,270 L; 1,920 US gal)
Firebox:
  Grate area17.7 sq ft (1.64 m2)
Boiler pressure180 psi (1.24 MPa)
Heating surface1,291.7 sq ft (120.00 m2)
CylindersTwo, inside
Cylinder size18 in × 24 in (457 mm × 610 mm)
Valve gearWalschaerts
Performance figures
Tractive effort20,512 lbf (91.24 kN)
Factor of adh.5.37
Career
Operators
Class
  • GER: L77
  • LNER: N7
Power classBR: 3MT
Number in class
  • 1 January 1923: 12
  • 1 January 1948: 134
Axle load classLNER/BR: Route availability 5
Withdrawn1957–1962
DispositionOne preserved, remainder scrapped
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