SPCRR 581 "Katie"

This 5-ton industrial switching locomotive was manufactured by Plymouth Locomotive Works with a gasoline engine and hydraulic transmission. It originally served the U.S. Army's Badger Ammunition Plant as #581, later renumbered to #588 [reason for renumbering unknown]. The Badger Army Ammunition Plant, located in Wisconsin, was a major U.S. military munitions manufacturing facility that maintained an extensive internal railroad for moving materials between production buildings.

Plant operations were suspended in 1977 and the facility permanently closed in 1997. The locomotive was sold at government surplus auction to a group of private buyers in 19*X* and stored in Long Beach, California from 2*0*X* to 201*X*. SPCRR purchased the locomotive in 1999 with the condition that it be named ""Katie"" after the daughter of one of the sellers - a requirement that was incorporated into the sale agreement and has been honored throughout SPCRR ownership.

The locomotive entered service as SPCRR #1 "Katie" and became the museum's primary motive power. Initial service revealed the gasoline engine's age, limitations, and higher operating costs. After several years of service, the yellow paint showed significant deterioration. A "guerrilla" spray paint job using rust red primer was applied and the locomotive maintained its #1 designation. By 2016, this temporary paint job had badly deteriorated.

During winter 2016, SPCRR volunteers undertook comprehensive refurbishment: the locomotive was stripped to bare metal, properly painted, and lettered as SPCRR #1. During winter 2018, a major mechanical upgrade replaced the gasoline engine with a diesel engine, and air brake controls and pump were added to meet air braking requirements for passenger train operations - a significant investment that greatly improved operational capabilities and safety.

In 2020, the locomotive was renumbered to SPCRR #581 "Katie," returning it to one of its original Badger Ammunition Plant numbers and providing historical continuity. It has served as the primary SPCRR motive power from 2015 to 2025, replacing our original horse-drawn service, and has accumulated thousands of hours in revenue service. 

* Unknown date information, closest confident date range used. 
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