Like others, mentally removing the peaked roof, which leaves a compound curved roof, which kind of looks like a horse drawn streetcar, but the wall framing is missing, and the top plates of the walls don't match any railroad construction I am familiar with... Which leads me to think that this might be a sheepherder's wagon or a portable farm kitchen (again a wagon)... which were more informally built.. and since the farm worker's were frequently specific ethnic groups, and carried some of their traditions into the construction of the wagons... In the SF Bay area (near the NG South Pacific Coast) many were Portuguese (from the Azores) and we see interesting wagons (but in their case peaked roofed).
Randy