http://openrails.org/This is obsecure to the loving limit.
My friend Owns a steam group for some Pretty loving chaotic Multiplayer sessions. He owns the one and only steam group for this puppy. I've been using it for a solid 2 years and IMO it was loving worth it.
Seriously,This game is about 3 years old and there's about only 20 users on their forums.
Plus,They do hold the record for the largest amount of freeware and payware content. A good 3 Million Plus in Content. Pretty sad to see a game with that much content go to waste.
Please don't hurt me he asked for obsecure and he's getting one of the most obsecure Online multiplayer games out there.