The engine had a long career with the Lake Superior & Ishpeming Railroad, working out of Marquette, MI.
It was retired in 1951 and stayed on the company's dead line at Marquette until the railroad sold three SC-1s (#32, #34 & #35) to the Marquette & Huron Mountain tourist railroad in 1963.
No. 34 was sold to the Western Maryland Scenic Railroad in 1991, where it was converted to make it look more like a Western Maryland Class H-7 2-8-0 locomotive and renumbered #734.
As of today the engine hauls passenger excursions and occasional freight trains at the Western Maryland Scenic Railroad.
- While operating on the Western Maryland Scenic Railroad, she has been nicknamed "Mountain Thunder".
- No. 34 worked for four years hauling passengers from West Yard to Big Bay, WI, and West Yard to Marquette, WI, on old LS&I track age.
- In November of 1967, #34 was sold to the Illinois Railway Museum were it used to be put on static display.
- Between October 21st and 22nd, 2013 the locomotive was renumbered 729.
- In May 2011, Jeopardy Host Alex Trebek took the throttle of mountain thunder for the railroading 101 category on November 25th just 6 months later.
- Then in 1993 the restoration was complete and it was working in operating condition.
- When it was bought by the WMSR and underwent a restoration and rebuild, including increasing boiler pressure to 200 psi, replacing the tender with New York Central Mohawk #2662's.
- Due to the restoration of Chesapeake & Ohio 2-6-6-2 #1309, Mountain Thunder ran its final regular trains of the 2015 season, and also some Freight Specials in February & April of 2016 for the ultimate disassembly of the FRA inspection.