It seem that something is corrupted in position checking while in public player mode. It's actually possible to build transformer stations WITHIN factories. After removing them, factory will remain crippled. Saving with transformer inside factory will assert-crash game during load.
(http://www.ii.uj.edu.pl/~szklarze/transcrash.JPG)
Konwn problem.
http://archive.forum.simutrans.com/topic/07247.0/index.html
ah sorry, that's right.
Anyway, that's kinda buggy behavior. Shouldn't this be fixed?
this is forbidden to public player in revision 2646