Best Train Simulator Game. – Subway Simulator 3D - Driving Review

I just have one question. I do not understand why you can see the other Passengers board the other trains at the stations but you will no longer see the passengers on the other trains as we bypass each other throughout our travel to our destinations, I am just curious to know why is this happening? Besides that this is my favorite simulator game.
Review by MTA Maryland33 on Subway Simulator 3D - Driving.