Big Barclay 0-6-0T "Harlaxton" was built as works number 2147 in 1941 at Andrew Barclay and Sons Ltd, Kilmarnock. She worked all her life at Harlaxton Ironworks Quarries in Northamptonshire, alongside a sister six-coupled Barclay called 'Ajax' which is now preserved at the Isle of Wight Steam Railway. She was preserved in 1969 by the newly-formed North Norfolk Railway and for many years ran on their line, gaining the unusual colour scheme seen above in 1990 to celebrate 100 years of the Midland and Great Northern Railway.

However, the North Norfolk put her up for sale in 1992 and she was bought by a consortium of members from the Ayrshire Railway Preservation Group who returned her to her birthplace in South-West Scotland. Here the plan was to run her on the British Coal-owned Dhoon Valley branch line at weekends. Unfortunately this plan failed to come to fruition due to a number of factors, and she was placed on-loan to the Caledonian Railway, arriving in 2001. At the end of the 2002 season she was taken out of service for boiler overhaul, and successfully returned to steam sporting a new black livery in December 2003.