NER Class R

Specifications
Configuration:;
• Whyte	4-4-0
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.	4 ft 0 in (1.219 m)
Driver dia.	6 ft 10 in (2.083 m)
Wheelbase	23 ft 9 in (7.24 m) engine ; 12 ft 8 in (3.86 m) tender ; 45 ft 10 3⁄4 in (13.989 m) total
Axle load	19.8 long tons (20.1 t; 22.2 short tons)
Loco weight	D20/1: 54.1 long tons (55.0 t; 60.6 short tons) ; D20/2: 55.45 long tons (56.34 t; 62.10 short tons)
Tender weight	41.2 long tons (41.9 t; 46.1 short tons)
Total weight	D20/1: 95.3 long tons (96.8 t) ; D20/1: 96.65 long tons (98.20 t; 108.25 short tons)
Fuel type	Coal
Firebox:; • Firegrate area	20 sq ft (1.9 m2)
Boiler	4 ft 9 in (1.45 m) diameter
Boiler pressure	200 psi (1.4 MPa) ; later reduced to 160 psi (1.1 MPa)
Heating surface	1,318.7 sq ft (122.51 m2)
• Tubes	638.7 sq ft (59.34 m2)
• Flues	292 sq ft (27.1 m2)
• Firebox	139 sq ft (12.9 m2)
Superheater:;
• Heating area	204 sq ft (19.0 m2)
Cylinders	two inside
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Valve gear	Stephenson

NER Class R ; LNER Class D20
	1907-built class R 2387, at Gateshead in 1954
Type and origin
Power type	Steam
Designer	Wilson Worsdell
Builder	NER Gateshead
Build date	1899-1907
Total produced	60
Specifications
Configuration:;
• Whyte	4-4-0
Gauge	4 ft 8 1⁄2 in (1,435 mm) standard gauge
Leading dia.	4 ft 0 in (1.219 m)
Driver dia.	6 ft 10 in (2.083 m)
Wheelbase	23 ft 9 in (7.24 m) engine ; 12 ft 8 in (3.86 m) tender ; 45 ft 10 3⁄4 in (13.989 m) total
Axle load	19.8 long tons (20.1 t; 22.2 short tons)
Loco weight	D20/1: 54.1 long tons (55.0 t; 60.6 short tons) ; D20/2: 55.45 long tons (56.34 t; 62.10 short tons)
Tender weight	41.2 long tons (41.9 t; 46.1 short tons)
Total weight	D20/1: 95.3 long tons (96.8 t) ; D20/1: 96.65 long tons (98.20 t; 108.25 short tons)
Fuel type	Coal
Firebox:; • Firegrate area	20 sq ft (1.9 m2)
Boiler	4 ft 9 in (1.45 m) diameter
Boiler pressure	200 psi (1.4 MPa) ; later reduced to 160 psi (1.1 MPa)
Heating surface	1,318.7 sq ft (122.51 m2)
• Tubes	638.7 sq ft (59.34 m2)
• Flues	292 sq ft (27.1 m2)
• Firebox	139 sq ft (12.9 m2)
Superheater:;
• Heating area	204 sq ft (19.0 m2)
Cylinders	two inside
Cylinder size	19 in × 26 in (483 mm × 660 mm)
Valve gear	Stephenson
Performance figures
Tractive effort	17,025 lbf (75.73 kN) ; later reduced to 15,567 lbf (69.25 kN)
Career
Operators	North Eastern Railway, London and North Eastern Railway, British Railways
Power class	BR: 2P
Retired	1943-1957
Disposition	All scrapped

The NER Class R (later, LNER Class D20) was a class of 4-4-0 steam locomotive, designed by Wilson Worsdell for the North Eastern Railway. They passed to the London and North Eastern Railway (LNER) in 1923. In 1936, some were rebuilt with long-travel piston valves and classified D20/2. The unrebuilt locomotives were re-classified D20/1.

Numbering

Forty-six D20/1 and three D20/2 locomotives passed to British Railways in 1948 and they were numbered 62340-62397 (with gaps).

The last D20 was withdrawn in 1957 and none were preserved.

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