A lot of talk in the new TSW3 announcement press release focused a lot on the simulation aspects of driving a train, such as weather. A further addition to the simulation aspect I feel is just as important is the passengers, who at the moment feel quite lifeless. Guard mode I think would be such a great idea for this game. I think it would be such a good thing for TSW to have. Bus Simulator already have co-op and passenger variation, which was one of the inspirations for me to make the video. Being able to play with other players would surely increase the longevity of the game. I've heard from a lot of people that they don't want co-op, but no one's suggesting they remove solo play, I just think for a simulation game to not involve the guard of a train, misses out half the experience.