I will usher you into the next world...
The Phantom Train is a boss in the Dawn of Souls and succeeding versions of the original Final Fantasy. It is one of the bosses of later Final Fantasy games that appears as an optional boss in the remake, this one being the Phantom Train boss of Final Fantasy VI.
The Phantom Train appears as part of a small mini-story on Floor B30 of the Whisperwind Cove. When it arrived in a village in the cove, the land and the villagers began to rot, appearing zombie-like. Eventually, several of them lost the ability to move, standing as statues. The villagers beg the Warriors of Light to eradicate the Phantom Train and remove the spell. When the Phantom Train is defeated, the villagers return to normal, and the land becomes fertile, and covered in flowers. Only once the boss is defeated is it possible to progress further into the dungeon.
There are several differences between this Phantom Train and its original in Final Fantasy VI. In the original, the Phantom Train approached the fleeing party from the right as the battle moved on, while in this, the train is stationary and on the left side of the screen, like all other enemies.
Game mechanics do not allow curative items and spells to be cast on enemies, so it is impossible to damage the Phantom Train with Potions or kill it instantly with a Phoenix Down. Being undead, the Phantom Train is still weak to Dia spells. The Phantom Train has only one special attack, Acid Rain, which hits the entire party for around 200HP of non-elemental damage every turn. Its normal attack can hit for around 300HP.
Because of Phantom Train's relentless party-wide assault, it is advisable to use the Rune Staff won from the previous battle against Orthros to cast Healara every turn and counter the damage from Acid Rain, while the rest of the party uses the usual strategy of casting Haste/Temper/Saber on the physical attackers.
If the party member using Rune Staff does not fully mitigate the damage from Acid Rain, two party members should be used for healing every turn, or as needed. The Phantom Train's HP is not high, so this battle should not be too difficult if the party can keep up with the damage from Acid Rain.
Ghost train refers to a phantom vehicle in the form of a locomotive or train.