GER Class L77

Specifications
Specifications
Configuration:;
• Whyte	0-6-2T
• UIC	C1 h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 10 in (1.473 m)
Trailing dia.	3 ft 9 in (1.143 m)
Wheelbase	23 ft 0 in (7.01 m)
Length	34 ft 10 in (10.62 m) over buffers
Axle load	16 long tons 3 cwt (36,200 lb or 16.4 t)
Adhesive weight	49 long tons 4 cwt (110,200 lb or 50 t)
Loco weight	61.8–64.85 long tons (62.79–65.89 t)
Fuel type	Coal
Fuel capacity	3 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 area	17.7 sq ft (1.64 m2)
Boiler pressure	180 psi (1.24 MPa)
Heating surface	1,291.7 sq ft (120.00 m2)
Cylinders	Two, inside
Cylinder size	18 in × 24 in (457 mm × 610 mm)
Valve gear	Walschaerts

Type and origin
Type and origin
Power type	Steam
Designer	A. J. Hill
Builder	Stratford Works (22); Gorton Works (40); Robert Stephenson & Co. (20); William Beardmore & Co. (20); Doncaster Works (32);
Build date	1915–1928
Total produced	134

GER Class L77
LNER Class N7
GER Class L77 ; LNER Class N7
	N7/1 on a suburban train for Brentwood, c.1927
Power type
Type and origin
Power type	Steam
Designer	A. J. Hill
Builder	Stratford Works (22); Gorton Works (40); Robert Stephenson & Co. (20); William Beardmore & Co. (20); Doncaster Works (32);
Build date	1915–1928
Total produced	134
Configuration:;
Specifications
Configuration:;
• Whyte	0-6-2T
• UIC	C1 h2t
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Driver dia.	4 ft 10 in (1.473 m)
Trailing dia.	3 ft 9 in (1.143 m)
Wheelbase	23 ft 0 in (7.01 m)
Length	34 ft 10 in (10.62 m) over buffers
Axle load	16 long tons 3 cwt (36,200 lb or 16.4 t)
Adhesive weight	49 long tons 4 cwt (110,200 lb or 50 t)
Loco weight	61.8–64.85 long tons (62.79–65.89 t)
Fuel type	Coal
Fuel capacity	3 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 area	17.7 sq ft (1.64 m2)
Boiler pressure	180 psi (1.24 MPa)
Heating surface	1,291.7 sq ft (120.00 m2)
Cylinders	Two, inside
Cylinder size	18 in × 24 in (457 mm × 610 mm)
Valve gear	Walschaerts
Tractive effort
Performance figures
Tractive effort	20,512 lbf (91.24 kN)
Factor of adh.	5.37
Operators
Career
Operators	Great Eastern Railway; → London and North Eastern Railway; → British Railways;
Class	GER: L77; LNER: N7;
Power class	BR: 3MT
Number in class	1 January 1923: 12; 1 January 1948: 134;
Axle load class	LNER/BR: Route availability 5
Withdrawn	1957–1962
Disposition	One preserved, remainder scrapped

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.

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