Well, no one uses the train at the moment because it doesn't exist. Build it and they will come, replacing the various bus services that operate in Melbourne and surrounding areas right now.
It would also wrong foot Mr Andrews and put pressure on him to reinstate a popular policy he rejected in order to cut open Swanston St for the best part of a decade.
Call me naive, but I am looking forward to the wedge being buried in australain politics. Or at least not the default go to strategy