He let out a bit of a thinking hum at the question. The lack of weapons was concerning, but he could fix some of that, albeit with primitive weapons. "Like I said, I can whip up bows, arrows, knives and spears pretty easily. Mankind has had those things since prehistoric times." He observed wryly.

"If I made a manual of everything I knew how to make, I'd be sitting there for years doing it." Senku huffed lightly. "It's pretty safe to assume I know how to make most things. Can I get what I need? That's a different question."

"The biggest challenge with a forge is ventilation. All that smoke has to go somewhere and setting one up in here without at least some kind of ventilation is a fast way to asphyxiating the entire train."