Thanks for the current photos:
#1 is probably a standard gauge body and may have been a caboose. There is a false ceiling where the cupola would have been. A view taken inside the car:
#2 has been reported to me as being a standard gauge car. But it is old! From the styling it could date from the 1869-70 era. There are a few other similar car bodies still around.
#3 the standard gauge box car body next to the service pit.
#4 no information as to heritage. Some thought that this may be a standard gauge car body. Someone needs to get inside and see if there are any numbers visible or stamped on top of any original doors. I doubt that the removal of a window sash would be allowed to check that for a stamped car number.
Here are some photos of #4 taken in May of 2008. I was able to enter into this private compound during a tour arranged for the SP Narrow Gauge Historical Society.
Brian Norden