This Yorktown class locomotive was built by Peckett & Sons in 1941. It is one of the smallest standard gauge locomotives ever built and is believed to be the smallest working standard gauge steam locomotive in Britain
It was supplied new to the Ministry of Supply and was originally employed at the Creekmoor Royal Ordance Factory (ROF) at Poole. Not a lot of information exists about this site, but it would appear that it was used to manufacture aircraft guns during and after the Second World War.
Around 1944 the locomotive was moved to the ROF factory at Llanishen in Cardiff. This factory opened in 1940 for the construction of field guns and other weaponry during the Second World War. The explosives were supplied from ROF Bridgend. Over 20,000 people were employed there. In 1960 the establishment became part of the Atomic Weapons Establishment as AWE Cardiff to manufacture components for the nuclear weapons programme. All production ceased there in 1997.
In 1967 the locomotive was sold to J W Hardwick, Sons & Co Ltd of West Ewell in Surrey who sold it on to W Lees of Godalming for preservation but by this time it was short of part of its cab and buffers.
It was sold in 1972 to the Reverend Teddy Boston who initially moved it to the Market Bosworth Steam Railway (later called the Battlefield Railway). It was restored to steam there and given the name Herbert.
In July 1982 the locomotive moved to the Teddy Boston’s Cadeby Light Railway in July 1982 and here the buffers were replaced.
Following the closure and sale of the Cadeby Light Railway in 2005 the locomotive was bought by Rob Gambrill and Jeremy Martin and it was taken to the Lavender line at Isfield. At this time the locomotive had stood idle for more than twenty years but by 2007 it had been restored and moved under its own steam once again and was now equipped with a rebuilt cab. It was initially the mainstay of the lavender Line put its size meant that it soon became unsuitable and larger locomotives were used.
In early 2011 the locomotive changed hands again. Since then it has visited many heritage railways and a period at the National Railway Museum at York.
The locomotive now carries the name Teddy in honour of the Reverend Teddy Boston.
The locomotive is now based on the Chasewater Railway where towards the end of 2017 it was withdrawn from service to have a ten year overhaul.