Location from Demon Slayer by Koyoharu Gotouge
The Infinity Train — a locomotive that Enmu fused his body with, turning every passenger into a hostage and every car into demon flesh in the fight that killed the Flame Hashira.
The Mugen Train starts as an investigation — passengers have been disappearing — and becomes a nightmare when Enmu reveals he's fused with the entire locomotive. Two hundred passengers become hostages, every surface is demon flesh that can attack, and the train is still moving at full speed through the night. The confined space forces close-quarters combat in corridors and between seats. This is where Rengoku died. After the train was defeated, Akaza appeared in the pre-dawn darkness and challenged the Flame Hashira. Their fight on the tracks beside the derailed train — Rengoku burning bright against Akaza's martial precision — ended with the sun rising on a dead Hashira and a fleeing demon. It's the most emotionally devastating location in the series.
Initially a normal Taisho-era steam locomotive with wooden passenger cars, lantern-lit interiors, and the rhythmic clatter of wheels on track. After Enmu's fusion, the train transforms: fleshy growths emerge from walls, eyes open in ceiling panels, mouths appear between seats, and the entire structure becomes organic. The exterior develops bone-like protrusions and the smokestack breathes something that isn't just steam.
Also known as: Infinity Train, Mugen Train, Demon Train