NER Class R1
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | Wilson Worsdell |
| Builder | NER Gateshead works |
| Build date | 1908-1909 |
| Total produced | 10 |
| Specifications | |
|---|---|
| Configuration | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 7 1⁄4 in (1.099 m) |
| Driver dia. | 6 ft 10 in (2.08 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 | 20.8 long tons (21.1 t) |
| Fuel type | coal |
| Boiler | 5 ft 6 in (1.68 m) diameter |
| Boiler pressure | 175 psi (1.21 MPa) |
| Cylinders | two inside |
| Cylinder size | 19 in × 26 in (480 mm × 660 mm) |
| Valve gear | Stephenson |
| Performance figures | |
|---|---|
| Tractive effort | 17,026 lbf (75.74 kN) |
| Career | |
|---|---|
| Operators |
North Eastern Railway London and North Eastern Railway |
| Disposition | None preserved |
The NER Class R1 (LNER Class D21) was a class of 4-4-0 steam locomotives of the North Eastern Railway. The class was designed by Wilson Worsdell and built from 1908 to 1909.
The design was similar to that of the NER Class R (LNER Class D20) but a larger boiler was used. Boiler pressure was initially 225 psi (1.55 MPa).
Boiler pressure was reduced to 180 psi (1.24 MPa) at an unknown date. Superheaters were fitted between 1912 and 1915 and, at the same time, boiler pressure was further reduced to 160 psi (1.1 MPa). It was standard NER practice to reduce boiler pressure when fitting a superheater. At some time before the 1923 Grouping, boiler pressure was increased to 175 psi (1.21 MPa).
The R1s were initially used on the Glasgow-Newcastle and York-Newcastle services. However, as train loads increased, they were replaced by more powerful locomotive types and relegated to secondary duties.
They were withdrawn between 1942 and 1946 and none is preserved.
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