Hi Trinity River Bottoms Boomer:
Thanks for checking out everyone's photos this week. You asked about the rusted boxcar & passenger car. It looks like the passenger car was moved to this yard recently. This photo is from Google Earth and was captured in the summer of 2019. You can see the boxcars from outer space but no passenger car.
Next time I am in Jackson I will seek out some information.
Hope this helps: Gary 🚂