I made a video to quickly show what the problem is http://youtu.be/YUCQ_hALm_c

Oh! Good catch! Looks like I need to rebuild the Train object when a cart dies.

Only problem is that there doesn't seem to be an event for that...

This is a very well done example of how to show us a bug. Thank you for making the effort to file the issue.

I'm gonna speculate that this fix has broken trains completely in 9.5.0.2, sadly. They no longer work for anything at all, except perhaps this scenario?

Haha, yeah. That's what I get for not testing changes. 9.5.0.3 should work.