"The void's...a little too big. For some of us." Some of us being Tidus, a laugh that's small, light. He looks down at the droid in his arms, quiet, before he starts, slow:

"There was...something about the train. I didn't have it in those papers I shared 'cause it's kinda strange - we saw a memory. Or, someone did. Something about the last Voidtrecker Express, or back when it used to be around? We heard it's some kind of legend."

And this was the one and the same, apparently. Despite all the time since then, whether or not it makes sense.