Mike G, the concrete is 6 inches thick in the middle. It has a 14-16 inch deep footer around the edge that's 6 in wide at the bottom. The footer is about 14 in wide when it meets the pad. It is not large enough for a caboose. The walls are only 10 ft tall.
However this place in Texas is up for sale.
But I don't know if I can afford the taxes on that grn/yel Burlington Northern caboose to the left of the white bldg .