Well, Doomtrain as a minion was hinted at as a joke during the Rising event in 2015, so, maybe it's coming eventually?

As for the differences between Doomtrain and FFVI's Phantom Train, they're largely trivial, as both are ghost trains that are sentinent (FFVI's one being an actual train that was destroyed in war, and then became a psychopomp guiding the departed to the other side). Doomtrain definetely looked more demonic though.

Either way, I say yes to this. I'm like Selphie, I like trains.