Thomas Wheatley

Thomas Wheatley (1821–1883) was a British locomotive engineer who served as Locomotive Superintendent of the North British Railway from 1867 until his dismissal in 1874, during which time he designed the first inside-cylinder 4-4-0 in Britain — a wheel arrangement that would become the definitive British express passenger locomotive type for the next half century.

Born at Hooton, Cheshire on 21 April 1821, Wheatley worked under John Ramsbottom on the London and North Western Railway's Northern Division at Crewe before being appointed to the NBR's senior locomotive post in 1867. The North British at the time operated a demanding variety of Scottish services including the Waverley Route Anglo-Scottish expresses between Edinburgh and Carlisle over some of the most demanding railway gradients in Britain, requiring locomotives capable of sustained effort on long climbs.

Wheatley's inside-cylinder 4-4-0 of 1871 addressed these requirements with a design that combined the adhesion and pulling power of four coupled wheels with the guidance and stability of a leading bogie — the bogie-and-coupled-wheel arrangement that Wheatley was among the first to apply to an inside-cylinder British express locomotive. The type's advantages became apparent over the following decades as every major British railway adopted variants of the 4-4-0 for express passenger work. Wheatley was dismissed from the NBR in November 1874 following allegations of financial irregularities and was succeeded by Dugald Drummond. He died at Bedlington on 4 April 1883.