Highland Railway O Class
|Highland Railway O class|
|Type and origin|
|Builder||HR Lochgorm Works|
|Configuration||2-4-0T (rebuilt as 4-4-0T)|
|UIC classification||1′B t, rebuilt as 2′B t|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|New: 3 ft 9 1⁄2 in (1.156 m)
Rebuilt: 2 ft 7 1⁄2 in (0.800 m)
|Driver diameter||4 ft 9 in (1.448 m)|
|Locomotive weight||New: 36 long tons 0 cwt (80,600 lb or 36.6 t)
Rebuilt: 44 long tons 0 cwt (98,600 lb or 44.7 t)
|Boiler pressure||140 lbf/in2 (0.97 MPa)|
|913 sq ft (84.8 m2)|
|Cylinder size||16 in × 22 in (406 mm × 559 mm)|
|Tractive effort||12,158 lbf (54.08 kN)|
|Operator(s)||Highland Railway →
London, Midland & Scottish
|Power class||LMS: unclassified|
The Highland Railway O Class locomotives were built as 2-4-0T tank engines, but were soon rebuilt as 4-4-0Ts. They were designed by David Jones and three were built at the company's Lochgorm Works in 1878 and 1879.
They had 4-foot-9-inch (1,448 mm) coupled wheels, 16-by-22-inch (406 by 559 mm) outside cylinders and weight (in original condition) of 36 tons.
|HR No.||Name||Date built||LMS No.||Withdrawn||Notes|
|58||Burghead||December 1878||15011||1928||Name removed in 1900. Renumbered 58A in 1912 and 58B in 1920|
|59||Highlander||June 1879||15010||1933||Name removed in 1900. Renumbered 59A in 1912 and 59B in 1920|
|17||Breadalbane||December 1879||15012||1929||Renamed Aberfeldy in 1886; name removed in 1900. Renumbered 50 in 1901, 50A in 1912, 50B in 1920|
They were rebuilt as 4-4-0Ts in 1881–82 due to trouble with the single leading axle.
Transfer to LMS
- Baxter, Bertram (1984). Baxter, David, ed. British Locomotive Catalogue 1825–1923, Volume 4: Scottish and remaining English Companies in the LMS Group. Ashbourne, Derbyshire: Moorland Publishing Company. p. 195.
- Casserley, H.C. & Johnston, Stuart W. (1974) . Locomotives at the Grouping 3: London, Midland and Scottish Railway. Shepperton, Surrey: Ian Allan. p. 153. ISBN 0-7110-0554-0.
- H. A. Vallance (1938) The Highland Railway