The Arlesdale Railway, also called the "Small Railway", is a 15"-gauge railway running from Arlesburgh along the old route of the Mid Sodor Railway toArlesdale. At Arlesburgh, connections can be made between it and theArlesburgh branch. The line is mainly used to transport waste materials from several of the abandoned mines at Arlesdale for use as ballast, but it also attracts popularity due to the novelty of being pulled by a 1/3 scale engine.
From Arlesburgh the line stops at Arlesburgh Bridge Street, Ffarquhar Road, Marthwaite, and Arlesdale Greenbefore turning south to Arlesdale.
The ownership of this railway is shared by the Small Controller and the Owner of the Skarloey Railway.