10¼"

No.4 'Norfolk Pioneer' was built at the Wells & Walsingham Light Railway in 2011, although it never became part of the permanent steam fleet at Wells. It was later sold to the Astbury Light Railway near Congleton in Cheshire and worked there until January 2024 when it moved to the Rudyard Lake Steam Railway. 
In the summer of 2014, the railway was sold, but Norfolk Pioneer was one of the locos that stayed behind. The line is now called the Rudyard Lake Railway.