I opened the game and wanted to start off with a challenge, so I didn't set anything up and just deleted the new game menu. I then played for about 5 minutes then when I wanted to expand the game map, Simutrans crashed. The video below is me showing what happened.
See for yourself:
http://www.mediafire.com/?x05jq7ma27d9tsv
Thank you - found and fixed on 10.x, and the fix will be incorporated in the next release.