NER Class R
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 | |
| Power type | Steam |
|---|---|
| Designer | Wilson Worsdell |
| Builder | NER Gateshead |
| Build date | 1899-1907 |
| Total production | 60 |
| Configuration | 4-4-0 |
| Gauge | Lua error in package.lua at line 80: module 'Module:Track gauge/data' not found. |
| Leading wheel diameter | 4 ft 0 in (1.219 m) |
| Driver diameter | 6 ft 10 in (2.083 m) |
| Wheelbase | 23 ft 9 in (7.24 m) engine 12 ft 8 in (3.86 m) tender Lua error in Module:Convert at line 452: attempt to index field 'titles' (a nil value). total |
| Axle load | 19.8 long tons (20.1 t; 22.2 short tons) |
| Locomotive 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) |
| Locomotive and tender combined 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 |
| Boiler | 4 ft 9 in (1.45 m) diameter |
| Boiler pressure | 200 psi (1.4 MPa) later reduced to 160 psi (1.1 MPa) |
| Fire grate area | 20 sq ft (1.9 m2) |
| Heating surface: Tubes | 638.7 sq ft (59.34 m2) |
| Heating surface: Flues | 292 sq ft (27.1 m2) |
| Heating surface: Firebox | 139 sq ft (12.9 m2) |
| Heating surface: Total | 1,318.7 sq ft (122.51 m2) |
| Superheater area | 204 sq ft (19.0 m2) |
| Cylinders | two inside |
| Cylinder size | 19 × 26 in (483 × 660 mm) |
| Valve gear | Stephenson |
| Tractive effort | 17,025 lbf (75.73 kN) later reduced to 15,567 lbf (69.25 kN) |
| Power class | BR: 2P |
| Retired | 1943-1957 |
| Disposition | All scrapped |
References
- Ian Allan ABC of British Railways Locomotives, part 4 (1948 ed.). p. 19.
Other websites
- D20/1 Rail UK
- D20/2 Rail UK
- The W.Worsdell Class D20 (NER Class R) 4-4-0 Locomotives LNER Encyclopedia