Years ago I visited the Sierra Railroad yards and found one of the old Yosemite Short Line boxcars on display.  It was in sad shape but I was able to stick my camera through various holes and get some photos of the interior.

Here is one photo:

Here is a link to those photos:

https://photos.google.com/album/AF1QipMrgy3N7ks4JlHkgSWrJifYqYpAGu8gJ1f19XoQ

More Bachmann 18' boxcars.