see screenshot
uhmm...where's the bug? I'm not able to see it.. :-\
River meets mountain/hill, vilvoh. It's impossible. ;D
There should be a canyon.
The bug was allready mentioned in the german forum (http://www.simutrans-forum.de/forum/thread.php?threadid=4095 (http://www.simutrans-forum.de/forum/thread.php?threadid=4095)).
Oh! now I see it....(http://www.greensmilies.com/smile/smiley_emoticons_kilroy.gif)
Interesting idea... if the program could detect these situations, it could "carve" the hill using the slope tools, it would give even more variety...