From my own experinces with the unreal engine i have found that is driveing physics are amazing if used corectly. So why not actaully make this the most realistic train sim ever, by adding in Hyrail and MOW vehicles. Hyrail vehicles would fuction as basicly a speeder and MOW equipment can have tasks asiggined to certain sections of track that the player must complete. I would love to see hyrail trucks in TSW (they would be great for exploration) and hope that they someday do come to a train sim.
