Yeah, the Phantom Train is already used as the name given to the Garlean magitek-powered train that the Empire uses to transport troops and supplies between Castrum Meridanium in Northern Thanalan and Castrum Centri in Mor Dhona. It's not yet physically shown though, but judging by the size of the tracks that are seen, it's huge (Yda even mentions several times how large the locomotive is, and Y'shtola agrees, saying it's a good thing that the Empire 'didn't give it wings'. Not to mention how uncomfortable it was to ride in ).

So yeah, a FFVI-style one probably won't be appearing in XIV I'm sorry to say, unless they use FFVIII's Doomtrain for a name instead.