What is the Barrier? Infinity Train’s Mirror World

Introduced in the Chrome Car, Infinity Train’s Reflection Enforcement is devoted to protecting the barrier between the mirror world and the prime world. Except, what damage have we ever seen done to the barrier? And why is it that they’re so eager to cross the barrier repeatedly to get one sliver content to live on the other side? There has to be something more to it.

Infinity Train’s mirror world comes up a lot in the second season, yet so much of it is still a mystery. Still, what’s a theory without some evidence to back it up? Even if Infinity Train never delves into the mirror world again, there’s a lot we can say.