Sperry Rail Service detector car 137 takes a break from rail testing along Southern Pacific's Provo Subdivision mainline in the Salt Lake Valley. The car was built by St. Louis Car for the Soo Lin... (more)
Sperry Rail Service car 137 performs rail defect testing along UP's remote Sunnyside Subdivision in eastern Utah. The car was built by St. Louis Car for the Soo Line in 1925. Sperry acquired it an... (more)