It appears there is a small track problem in the horseshoe route that will cause the train to derail, near milepost 259, on the NYNo1 Ewd Frt track.

What's interesting, if you open the World Editor, delete the piece of track highlighted in yellow between the two red triangles in the black circles, then use the undo button to put it back and weld both ends it will now work properly. At least it does on my route. Hopefully this will be a quick fix and update for the RSC team
Regards,
Rich S.