When there are many players and many networks of transport, this is what happens:
(http://205.196.121.43/8i657u439bwg/ddovslcotq6cl53/st3.PNG)
I suggest a (filter button) to choose the network of the player you be want to track it.
thus not will have problems with transport networks on a large scale
(http://199.91.153.77/hgkll1t6c5tg/9h2b6za2aadl3n3/260481_272333334tttt80_528312683_n.jpg) News of Simutrans on facebook (http://www.facebook.com/Simutrans.BLOG?)