Transport Tycoon, Roller Coaster tycoon with all the fun of rollercoasters removed, only works on XP with a patch applied but my version refuses to patch, however I found OpenTTD - Transport Tycoon Deluxe basically recreated and improved, opensource woohoo
http://www.openttd.com
I got a 'patch' to make the face chooser better but then found out I have to get the C++ exe source code and put it in the right place and compile it myself, which I have no clue how to do.