The Highland Railway O Class locomotives were built as 2-4-0T tank engines, but were soon rebuilt as

4-4-0T T, or t, is the twentieth letter in the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''tee'' (pronounced ), plural ''tees''. It is deri ...

s. They were designed by David Jones for Scottish Railway companies and three were built at the company's

Lochgorm Works The locomotives of the Highland Railway were used by the Highland Railway to operate its lines in the north of Scotland. The Highland Railway locomotive works was at Lochgorm, Inverness. The works had been built about 1855 by the Inverness and Na ...

in 1878 and 1879.

Dimensions

They had coupled wheels, outside cylinders and weight (in original condition) of 36 tons.

Numbering

Rebuilding

They were rebuilt as

s in 1881–82 due to trouble with the single leading axle.

Transfer to LMS

All three were still in service in 1923, although relegated to shunting duties, and they were transferred to the

London, Midland and Scottish Railway The London, Midland and Scottish Railway (LMSIt has been argued that the initials LMSR should be used to be consistent with LNER, GWR and SR. The London, Midland and Scottish Railway's corporate image used LMS, and this is what is generally u ...

(LMS) at the

Grouping Grouping may refer to: * Muenchian grouping * Principles of grouping * Railways Act 1921, also known as Grouping Act, a reorganisation of the British railway system * Grouping (firearms), the pattern of multiple shots from a sidearm See also ...

References

* * *H. A. Vallance (1938) ''The Highland Railway'' {{Highland Railway locomotives O Class 4-4-0T locomotives Railway locomotives introduced in 1878