NBR J class
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| Type and origin | |
|---|---|
| Power type | Steam |
| Designer | William P. Reid |
| Builder |
North British Locomotive Company and NBR Cowlairs Works |
| Build date | 1909-1920 |
| Specifications | |
|---|---|
| Configuration: |
|
| • Whyte | 4-4-0 |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Leading dia. | 3 ft 6 in (1.07 m) |
| Driver dia. | 6 ft 6 in (1.98 m) |
| Length | 46 ft 8.5 in (14.24 m) |
| Axle load | 18.4 long tons (18.7 t) |
| Loco weight |
54.8 long tons (55.7 t) D29, |
| Tender weight | 46.0 long tons (46.7 t) |
| Fuel type | coal |
| Firebox: • Firegrate area |
21.13 square feet (1.963 m2) |
| Boiler | 5 ft 0 in (1.52 m) diameter |
| Boiler pressure | 190 psi (1.3 MPa) D29, 165 psi (1.14 MPa) D30 |
| Heating surface: • Tubes |
1,478.3 square feet (137.34 m2) D29, 871.3 square feet (80.95 m2) D30/1 677.0 square feet (62.90 m2) D30/2 |
| • Firebox | 139.7 square feet (12.98 m2) |
| Cylinders | 2 |
| Cylinder size | 19 in × 26 in (480 mm × 660 mm) D29, 20 in × 26 in (510 mm × 660 mm) D30 |
| Valve gear | Stephenson |
| Performance figures | |
|---|---|
| Tractive effort | 19,434 lbf (86.45 kN) D29 18,700 lbf (83 kN) D30 |
| Career | |
|---|---|
| Operators | NBR, LNER, BR |
| Class | NBR J; LNER D29 and D30 |
| Power class | BR: 3P |
| Numbers | 243-245, 338-340, 359-363, 400, 409-428, 497-501, 895-899, 990 |
| Nicknames | Scott class |
| Retired | 1960 |
| Disposition | All engines scrapped |
54.8 long tons (55.7 t) D29,
57.3 long tons (58.2 t) D30/1,
The NBR J Class (LNER Classes D29 & D30), commonly known as the Scott class, were a class of 4-4-0 steam tender locomotives designed by William P. Reid for the North British Railway. They passed to the London and North Eastern Railway at the grouping in 1923. Ten D29s and 25 D30s survived into British Railways ownership in 1948.
The Original J Class locomotives were based on the NBR K Class mixed traffic 4-4-0s. The J Class had 6' 6" driving wheels for express passenger work and a large tender which carried sufficient water to allow passenger trains to run non-stop between Edinburgh and Carlisle. These locomotives were named after characters in the novels of Sir Walter Scott and naturally became known as "Scotts". Some of the names were later re-used on LNER Peppercorn Class A1 locomotives.
Six locomotives were built in 1909 by the North British Locomotive Company and a further ten were built in 1911 by the North British Railway at its Cowlairs railway works, followed by two further identical locomotives with superheaters. The NBR always referred to these locomotives as J Class, but the LNER classified the initial 16 locomotives D29, and the two superheated locomotives as D30. A further 25 superheated locomotives were built between 1914 and 1920 and the LNER classified these as D30/2.
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