NER Class R

NER Class R
LNER Class D20

Specifications
Configuration	4-4-0
Gauge	1,435 mm (4 ft 8 ¹⁄₂ in) 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	None preserved

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The last D20 was withdrawn in 1957 and none were preserved.

Pre-grouping railway designs:

Great Central:	A5 B1/B18 B2/B19 B3 B4 B5 B6 B7 B8 B9 C4 C5 C13 C14 D5 D6 D7 D8 D9 D10 D11 D12 E2 E3 E8 F1 F2 G3 J8 J9 J10 J11 J12 J13 J58 J59 J60 J61 J62 J63 L1/L3 M1 N4 N5 N6 O4 O5 Q4 S1 X4 Y2

Great Eastern:	B12 D13 D14 D15 D16 E4 F3 F4 F5 F6 F7 G4 J14 J15 J16 J17 J18 J19 J20 J65 J66 J67 J68 J69 J70 N7 Y4 Y5 Y6 Z4/J92

Great North of Scotland:	D38 D39 D40 D41 D42 D43 D44 D45 D46 D47 D48 G10 J90 J91 Z4 Z5

Great Northern:	A1 C1 C2 C12 D1 D2 D3 D4 E1 G1 G2 J1 J2 J3 J4 J5 J6 J7 J50 J51 J52 J53 J54 J55 J56 J57 K1 K2 K3 N1 N2 O1 O2 Q1 Q2 Q3 R1

North British:	C10 C11 C15 C16 D25 D26 D27 D28 D29 D30 D31 D32 D33 D34 D35 D36 D50 D51 E7 G7 G8 G9 J31 J32 J33 J34 J35 J36 J37 J81 J82 J83 J84 J85 J86 J88 N14 N15 Y9 Y10

North Eastern:	A2 A6 A7 B13 B14 B15 B16 C6 C7 C8 D17/1 D17/2 D18 D19 D20 D21 D22 D23 E5 E6 F8 G5 G6 H1 J21 J22 J24 J25 J26 J27 J71 J72 J73 J74 J76 J77 J78 J79 N8 N9 N10 Q5 Q6 Q7 T1 X1 X2 X3 Y7 Y8 EB1 EE1 EF1 ES1

North Eastern (ex Hull & Barnsley)	D24 J23 J28 J75 J80 N11 N12 N13 Q10

LNER designs:

Other designs:

Proposed designs:

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