The Sekisui Main Line, which circles the grounds of the SEKISUI KINZOKU CO., LTD. Tsurugaoka Factory in Tsurugashima City, Saitama Prefecture, is a cultural attraction dedicated to conveying Britain's preserved railway heritage.

The world's newest steam locomotive, OSCAR, which operates on the railway, was newly built specifically for the Sekisui Main Line and bears the class name EMESLETT. Oscar was built in Japan by the RASSCHIJIN Railway Society and completed in 2024. Its design draws inspiration from two highly distinctive sources: the whimsical steam locomotives illustrated by Rowland Emett and the iconic Hunslet engines that have come to symbolise British narrow-gauge railways.