But apparently the game has quite a fan base that wouldn't let it die and is now available for free as an open source game now known as OpenTTD! I am so addicted to this game right now.
It has a pretty steep learning curve, so it your going to play it, I strongly recommend watching these tutorial Youtubes, starting with this one on how to download and install the game:
But I warn you: If you play this game, a large chunk of time will evaporate from your life! Yes sir! A large chunk of time!