Originally fitted with a balloon type spark arresting chimney when working from Didcot shed in the local ordnance depot. When these duties were dieselised No 3709 was transferred to Oswestry (via Truro!) in 1962 where the spark arrestor had been removed, leaving a stump stovepipe as a chimney. Later moved to Croes Newydd, this engine became a late survivor, not being withdrawn until August 1966 by which time it had aquired a new chimney.

© David P Williams Archive / Rail-Online