The Sodor and Mainland Railway (abbreviated as S&MR) was the first standard gauge railway built on the Island of Sodor. Despite its name, it never reached the Mainland and was a financial disaster. It was absorbed into the North Western Railway in 1914.
The line was first promoted in 1850 and was projected to link Barrow-in-Furness with Suddery, the ancient capital of Sodor. There was plenty of local enthusiasm, but little intrest in the service on the Mainland.