LMS Stanier Class 8F 8233

London, Midland and Scottish Railway Stanier Class 8F No. 8233, later War Department No. 307 and 70307, Iranian State Railways No. 41-109, Longmoor Military Railway 500 and British Railways No. 48773, is a preserved British steam locomotive whose owners call it possibly Britain's most travelled preserved locomotive. It was built in 1940 by the North British Locomotive Company of Glasgow, works number 24607, on the orders of the War Department, which had adopted the Stanier 8F as its own standard. In 1948 it was at Suez needing a new firebox and was almost scrapped, but it returned to England in 1952 and was overhauled at Derby Works.