Like Brian says, there were a number of 42" streetcar lines in the West. I rode LA Railways as a kid-and it is a cherished memory. There was Lamoine Lumber and Box Co. west of Portland. They started out with retired Portland steam dummies (when Portland lines went electric), and they also ordered a CLimax. They had an incline to boot, but that operation expired early in the last century.
WM Ritter owned a number of lumber roads in Appalachia spiked to three different guges, including 42". That particular line lasted till the late 1950s with a couple of 2-truck Shays.
Another line was the Dismal Swamp line in Georgia, and they ran into the 1940s with some Baldwin 2-6-2s.
42" was popular with coal mines back east, and there were several big antracite operations that used them with steam,the biggest being Lehigh Coal and Navigation.