I've heard some talk about the Metrocars being transported by rail, so therefore using the shared tracks on the Sunderland line to get down to Doncaster. Couple of questions: 1) What type of loco(s) and barrier stock would be needed for a move such as this? 2) What speed would they be limited to? 3) Is there any rules saying that this cannot be done? For three I've heard there has to be special dispensation given, which apparently has been agreed.