So Vickers was a little distracted with obsessing observing the model train they had running between desks, poking at it a bit and making it move with his fingers along the tracks. By the time he looked up half the class gave practically every answer he knew about the Hogwarts Express and its illustrious and slightly controversial history. What else can he say? He felt like he should say something. Trains and Vanderbilts-- an unspoken expectation see?

Well there was a little detail that hasnt been mentioned. Up goes the hand."Professor, the Hogwarts Express is operated by the Hogwarts Railways. They own the locomotive that makes the trip between Kings Cross to Hogsmeade Station and back." And he could guess they were probably involved in the investigation of the train grinding to a halt at the start of term.