Dark trains. They're giant steampunk kamikazie 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 truely drives their horror home is they're 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 incoherant 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.