Doll is a gauge steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 in service at the Leighton Buzzard Narrow Gauge Railway in Bedfordshire

Bedfordshire

Bedfordshire is a ceremonial county of historic origin in England that forms part of the East of England region.It borders Cambridgeshire to the north-east, Northamptonshire to the north, Buckinghamshire to the west and Hertfordshire to the south-east....

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Industry

Doll was built by Andrew Barclay Sons & Co. in 1919 (works number 1641), and was one of three identical engines built for the Sydenham ironstone quarries, near Banbury in Oxfordshire. The quarries were closed in 1925 and the engines were sent to Bilston steelworks, near Wolverhampton. "Doll" worked there until she was withdrawn from service in 1959.

Preservation

"Doll" was then preserved near Kenilworth, Warwickshire, and then at Bressingham Steam and Gardens museum, Doll arrived at Leighton Buzzard Narrow Gauge Railway in 1969.

"Doll" was temporarily withdrawn from service at the Leighton Buzzard Narrow Gauge Railway in 19??,. at which point she received a new all welded boiler from Bennett Boiler and a full bottom end overhaul at Alan Keef Ltd. The valve gear was fitted with new eccentrics and repined and bushed to remove the lost motion which had developed. It was seen that at some point in the locomotive's past the wear had been compensated for by sawing part of the lap from the slide valves and filling in notches in the reversing quadrant near mid-gear. After repair the engine returned to LBNGR and is now in regular use.