A 5 ton Plymouth gasoline powered locomotive with a hydraulic transmission. It is a modern industrial locomotive used for operations, switching, and maintenance of way. This engine was purchased by the SPCRR in August 2004 after leasing it for several years from a member.
It is nicknamed 'Katie'.
After a few years of service, the yellow paint was starting to show it's age and a 'guerrilla' spray paint job of rust red primer was applied and the engine was renumbered SPCRR 1.
By 2016, the 'guerrilla' paint job had deteriorated badly and in the winter of 2016 this engine was refurbished, stripped to bare metal, painted, and lettered as SPCRR 1.
During the winter of 2018 The gasoline engine was replaced with a diesel and air brake controls and pump were added to allow State air braking requirements for the passenger train. In 2020 then engine was renumbered #581.
