I don't know how to explain it now

In the savegame above, would crash when I build a stop, but I tried the game later, and if I rotate back to the "default" rotation (ie. the one Simutrans starts in), then the crashes stop. I crashed it a few more times building roads and rails, but again that was rotated (in my case, click rotate twice from the original view).
I managed to play for 30 simuyears using rotations without a crash. Maybe it is a pak128 object not liking rotations.