Hi guys,
I also had trains derail on Ro, though not as much as on Ks, and it was on a very busy day. But, additionally, I also had a train crash which I sent on the left track to Ks (outgoing from Lewkow), so this happens in both directions. It's really sad, because I like the scenery very much.
Edit: I believe that the EN57 have the least problems in getting past the critical point. I myself drove one through, I saw my wheels for a short time, but they flipped back into position without me crashing. On the other hand, trains with IC or Cargo carriages seem to crash most of the time.