Duncan was built in 1928 by the Andrew Barclay Locomotive Works by order of the Royal Air Force (RAF) to work at one of their industrial railways in Scotland. After being put up for sale somewhere around 1958, he was acquired by Sir Handel Brown II, the owner of the Skarloey Railway on Sodor, whilst he was looking for a spare engine to stand in for Peter Sam whilst he was taken out of service following an accident. Duncan was a bit to handle because his large cab and funnel got wedged in low hanging bridges and tunnels. His narrow wheelbase was also a bit of a problem too, allowing him to do 'Rock 'n' Roll' which often caused derailment. After some attitude adjustments, Duncan has settled down and has become a reliable member of the Skarloey Railway's proud fleet of steam engines.
EDIT: Received a long-needed update on the shape and livery to make it more accurate to the original and to the RWS interpretation.
Sprites (C) Zexion/Nictrain123
I don't own Thomas (only the sprites). It is owned by the Awdry Family and Mattell.