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.

NER Class R
LNER Class D20
1907-built class R 2387, at Gateshead in 1954
Type and origin
Power typeSteam
DesignerWilson Worsdell
BuilderNER Gateshead
Build date1899-1907
Total produced60
Specifications
Configuration:
 • Whyte4-4-0
Gauge4 ft 8+12 in (1,435 mm) standard gauge
Leading 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+34 in (13.989 m) total
Axle 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 typeCoal
Firebox:
 • Grate area20 sq ft (1.9 m2)
Boiler4 ft 9 in (1.45 m) diameter
Boiler 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 inside
Cylinder size19 in × 26 in (483 mm × 660 mm)
Valve gearStephenson
Performance figures
Tractive effort17,025 lbf (75.73 kN)
later reduced to 15,567 lbf (69.25 kN)
Career
OperatorsNorth Eastern Railway, London and North Eastern Railway, British Railways
Power classBR: 2P
Retired1943-1957
DispositionAll scrapped

Numbering

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

Preservation

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The last D20 was withdrawn in 1957 and none were preserved.

References

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  • Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 19.
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