Sigrid of Arlesdale was designed as a 2-C-2 Diesel/Hydraulic locomotive by Ivan Farrier and was built at Severn Lamb in Stratford, England in 1969. She was built with a Ford 4 cylinder engine, but after extensive trials under normal traffic conditions, it was found this did not give enough power. It was replaced with a 6 cylinder Perkins from plans made by The Small Controller and Ivan Farrier, and performance has greatly improve. Sigrid is one of four diesel locomotives on the Arlesdale Railway and was named after the Sudrian heroine from the eleventh century who secured the defeat of the Norman Invasion in 1094.