A wainwright was a craftsman skilled in the making and repairing of wagons. “Wain” was an old word for a large farm wagon. Also working in the shed would have been wheelwrights and blacksmiths. I know this through genealogy research as, in the 1880s, several of my ancestors were wainwrights and teamsters (wagon drivers).
This shed is located in the ghost town of Shaniko, Oregon. There are a few permanent residents in what’s left of the town and from time to time a tourist shop will spring up only to die after a year or so. Shaniko is located on a busy highway but everyone is always in a hurry to get somewhere else.