[If Yugi was being honest this question has been bugging him for a very long time at this point. But he knew to feel at least somewhat better about it he had to ask.]

I know that people who die on the train end up with a little symbol because of it. Is there a reason for this exactly? Is there something that can happen so it needs to be tracked, or am I just being paranoid about the whole thing?

[Yep... Yugi has been bugged about that for a while now.]