Back in my working days we had a new hire who was making numerous trips south to move his train. I figured he had a large HO setup until I went to his house to see it. What he had was the Joe Douglass narrow gauge locomotive from Dayton, Sutro & Carson Valley Railroad. He had found it in front of a real estate office in Palm Springs, did some research and restored it. Its history included the Dayton Valley and building the Lake Arrowhead Dam.
He had a great photo album of the restoration which included making molds and casting missing or broken parts. I don't think he certified the boiler but he could run the locomotive off his air compressor. He had a couple hundred feet of track in his yard and a flat car.
I think he sold it to the Nevada Railroad Museum in 94.