Just finished FMAB and felt myself wondering why the nationwide transmutation circle had railroad tracks in every underground circle?

There was some interesting discussion here with regards to how the tracks were even able to be laid in the first place. I mean, it seems like an alchemist would be necessary at the very least to transmute ore in the underground into iron tracks, and then as for the wood, maybe carbon trapped in the ground.

I didn't feel like any of the explanations in that thread were particularly satisfactory because from what I saw in the show, with the exception of Father, homunculi don't seem to perform alchemy.

And clearly there were no teams of people entering and exiting the tunnels to lay tracks as when Sloth completes the circle in Briggs, there is no one laying tracks as he completes the digging.

All that aside though, my real question is: why are there tracks in the first place? They could have just been empty tunnels, right?

Is this just an unanswered question of the show? Or have I missed something?

  • 2
    The dirt has to go somewhere. Presumably, just like a real mineshaft, the rails were used to cart the dirt from the dig out of the shaft. I don't recall there is anything in the manga (or anime) to back this up though, but it logically makes sense.
    – Larnu
    Commented Feb 16, 2023 at 16:36

1 Answer 1


There's a real possibility that people did "get in" but never got out. And i can assume that the tracks are there for the purpose of Sloth getting faster in a part that needs repair or if he has to surface in specific places.

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