This 0-4-0ST quarry engine was built by the Hunslet Engine Company, Leeds in 1899 (works No.707) for Pen-yr-Orsedd Quarry, in the Nantlle Vale. She was bought in 1965 for preservation by a private consortium of FR workers and volunteers, and was first steamed on the FR in July 1966. Its blue livery is based on that of the former Great Northern Railway of Ireland.
Britomart visited Dublin in 1974, courtesy of Sealink, to publicise the Great little Trains of Wales in the annual St Patrick's Day Parade. It visited the Leighton Buzzard Railway during September and October 1986 and the WHRL in 1990.
In 2007 a major overhaul and repairs, including the fitting of a new inner firebox, was completed. Britomart visited the WHR(C) for the first time when it attended the "Join In" Weekend on 8-9 September 2007.
In February 2009 Britomart probably became the first Quarry Hunslet to be fitted with a very effective Master Mechanics spark arrestor allowing it to be used in dryer weather. A small ejector was also fitted for uphill running, reducing the demand on the boiler and tank than the one fitted in 1982 ( same size as Prince's! ). There aren't many occasions for making enough vacuum for 11 carriages with a Quarry Hunslet, but it is useful sometimes!
In 2010,it visited Hollycombe for their railway weekend and attended an open day at Tyseley with Lilla on 26-27 June.
Also in 2010 it had some mechanical work done, including new piston rings (replacing ones fitted in 1936, I think!). Axleboxes whitemetalled, horn faces surface ground and squared up. Due to whitemetal bearings, under feed lubrication has been fitted. The journals were also skimmed.
Principal stated dimensions are: Cylinders: 7" x 10", Nominal wheel diameter: 1' 8", Boiler pressure: 160 psi. Major overhauls 1966 & 1982.