It's even more disturbing when paired with the description it gets in the Hyrule Historia. The decapitated Malladus beast head begs Link "Please, help me" as it melts, which makes you wonder...is the cry for mercy coming from Malladus or Chancellor Cole, who was unwillingly possessed and mutated? He unquestionably deserved his fate but one can't help but feel sorry for him...
Dark trains. They're giant steampunk kamikaze trains with creepy flaming faces which patrol areas of the map with the intention of ramming you and exploding. Normally, they would be classified as Demonic Spiders, but what truly drives their horror home is their theme song. You're driving along, and see one coming up behind you on your map, then, once they come within draw distance and you see how imposing they are, the lovely overworld music is replaced with a frantic, almost incoherent mess of a song. Armoured trains are far worse, While dark trains have the personality of a random number generator trapped in a hockey arena, Armoured Trains actively pursue you, even going as far as to change direction, and even try to sneak up on you. And there's nothing more startling than to be chasing down trains in the Endgame, only to have that last one turn around and rocket down the tracks at you at five times it's normal speed just as your tear of light wears out.
The fact that the first encounter you have with them has a huge chance of them sandwhiching you? Sleep with the image of two demonic trains coming from ahead and behind, and you being as vulnerable as a princess because you took the wrong route.
Cole subtly revealing his true nature after Link's ceremony at the beginning of the game is undeniably creepy.