So, I have found that the other tire on the Pennsy was bad as well. so I now have two new tires on it, and it seems to go thru that inside turn, both forward and backward, with no issues.
It has been problematic when backing thru turnouts on Lionel Fastrack, but that may have been due to the tire situation.
So it remains to be seen, how it will do when backing thru the ross turnouts, but I am very hopeful that it will be OK, now that the tire situation has been corrected.
I have no experience with Ross switches, and I only mention this as a possible last resort to look at. If your switches do not have a plastic cross-over plate in the middle of them, then kindly disregard.
I have had two Lionel 022 Switches, where the fixed plastic "frog" in the middle was slightly too tall. I know this sounds crazy, but when my cars, and one engine, ran through the switches, inbound on the curved section, the inside front wheels would hit that plastic frog and "rise up" just a hair, resulting in the front trucks derailing.
Were my switches level? Yes. I know this because I replaced these switches with other identical switches, and the trains rain fine.
I took a dremel tool, with a fine grit wheel, and very very gently ground down the interior flat section and rail section of the plastic frogs on the defective switches, just a tad. Then they worked fine. (The problem is that molded plastic frogs are sometimes not molded perfectly.)
Just maybe something to take a look at.
Mannyrock
P.S. - My large heavy diesel locos (Williams 44 ton, and Lionel FA-2) had never had a problem crossing those defective plastic centers, only steamers and cars being pushed in front of an engine.
