| Caledonian Railway 812 Class | |
|---|---|
| Power type | Steam |
| Designer | John F. McIntosh |
| Builder | CR St. Rollox Works, Dübs & Co. (15), Neilson, Reid & Co. (20), Sharp Stewart (15) |
| Build date | 1899–1909 |
| Total produced | 96 |
| Configuration | 0-6-0 |
| UIC classification | Cn |
| Gauge | 4 ft 8 1⁄2 in (1,435 mm) |
| Driver diameter | 5 ft 0 in (1.52 m) |
| Length | 56 ft 1 in (17.09 m) |
| Locomotive weight | 45.65 long tons (46.38 t) |
| Boiler pressure | 160 psi (1,100 kPa) |
| Superheater type | None |
| Cylinders | Two, inside |
| Cylinder size | 18.5 × 26 in (470 × 660 mm) |
| Valve gear | Stephenson |
| Valve type | Slide valves |
| Tractive effort | 20,170 lbf (89.7 kN) |
| Career | CR • LMS • BR |
| Class | CR: 812 |
| Power class | LMS/BR: 3F |
| Number in class | 1 January 1923: 96 1 January 1948: 93 |
| Withdrawn | 1948–1963 |
| Preserved | No. 828 |
| Disposition | One preserved, remainder scrapped |
The Caledonian Railway 812 Class, or "Jumbos" is a class of 0-6-0 steam tender locomotive designed by John F. McIntosh and introduced in 1899. It featured the boiler from the 721 “Dunalastair” Class 4-4-0s.
Contents |
| Year | Quantity | CR Nos. | Builder | Builders No. | LMS Nos. | BR Nos. | Notes |
|---|---|---|---|---|---|---|---|
| 1899 | 17 | 812–828 | CR, St. Rollox | 17550–17566 | 57550–57566 | ||
| 1899 | 10 | 829–838 | Neilson, Reid & Co. | 5613–5622 | 17567–17576 | 57567–57576 | |
| 1900 | 10 | 839–848 | Neilson, Reid & Co. | 5623–5632 | 17577–17586 | 57577–57586 | |
| 1900 | 15 | 849–863 | Sharp Stewart | 4633–4647 | 17587–17601 | 57587–57601 | |
| c.1900 | 15 | 864–878 | Dübs & Co. | 3880–3894 | 17602–17616 | 57602–57616 | |
| 12 | 282–293 | 17617–17628 | 57617–57628 | ||||
| 8 | 652–659 | 17629–17636 | 57629–57636 | ||||
| 4 | 662–665 | 17637–17640 | 57637–57640 | ||||
| 4 | 325–328 | 17641–17644 | 57641–57644 | ||||
| 1 | 661 | 17645 | 57645 |
Seventeen were fitted with the Westinghouse air brakes for passenger train working, including the only surviving engine of the class, No. 828. All 96 passed to the London, Midland and Scottish Railway at the 1923 grouping. Only three, 17567, 17598 and 17610, had been withdrawn by the time of nationalisation in 1948. The last locomotive in service was not withdrawn until 1963.
Locomotive 828 (LMS 17566, BR 57566) is the sole survivor of the class and is an important example of Scottish industrial heritage. It is currently in service at the Strathspey Railway.
In The Railway Series children's books by the Rev. W. Awdry, the characters Donald and Douglas ("the Scottish twins"), are based on the Caledonian 812 class.[1]