NER Class R

4 ft 8+1⁄2 in (1,435 mm) standard gaugeLeading dia.4 ft 0 in (1.219 m)Driver dia.6 ft 10 in (2.083 m)Wheelbase23 ft 9 in (7.24 m) engine
12 ft 8 in (3.86 m) tender
45 ft 10+3⁄4 in (13.989 m) totalAxle load19.8 long tons (20.1 t; 22.2 short tons)Loco weightD20/1: 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 weight41.2 long tons (41.9 t; 46.1 short tons)Total weightD20/1: 95.3 long tons (96.8 t)
D20/1: 96.65 long tons (98.20 t; 108.25 short tons)Fuel typeCoalFirebox:​ • Grate area20 sq ft (1.9 m²)Boiler4 ft 9 in (1.45 m) diameterBoiler pressure200 psi (1.4 MPa)
later reduced to 160 psi (1.1 MPa)Heating surface:​ • Firebox139 sq ft (12.9 m²) • Tubes638.7 sq ft (59.34 m²) • Flues292 sq ft (27.1 m²) • Total surface1,318.7 sq ft (122.51 m²)Superheater:
​ • Heating area204 sq ft (19.0 m²)Cylinderstwo insideCylinder size19 in × 26 in (483 mm × 660 mm)Valve gearStephenson

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).

Preservation

The last D20 was withdrawn in 1957 and none were preserved.

References

External links

• D20/1 Rail UK
• D20/2 Rail UK
• The W.Worsdell Class D20 (NER Class R) 4-4-0 Locomotives LNER Encyclopedia