NER Class R
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Wilson Worsdell |
| Builder | NER Gateshead |
| Build date | 1899-1907 |
| Total produced | 60 |
| Specifications | |
|---|---|
| Configuration | 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: |
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| • 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.
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The last D20 was withdrawn in 1957 and none were preserved.
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Wikipedia