My shirt? Ah, yes, it does have something to do with the train. In short, all of us seem to be randomly put into what are called "teams", but unfortunately I do not know much more than that. I have not been here long enough to know more.

[And she missed out on the last mission as well to understand more of why they're separated into these teams.]

What I do know, is that the longer one remains on this platform, the more danger and dread they will feel. I do not, however, know what results in refusing to get on. I did not wish to experience that upon my arrival.