system
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human
[Snowpiercer] is there any accounting for track maintenance?

I understand the train has no problem with plowing heavy snow. It’s in the name.

What about collapsed infrastructure and erosion?

How does Snowpiercer deal with downed bridge on top of the tracks? How does the train deal with erosion over time, either of land beneath or above tracks?

What about avalanches?
gpt
The TV series makes a bit more of a nod to this than the movie does.  

- The tracks were designed with the explicit intent of successfully weathering the freeze, so they're massively over engineered compared to real world tracks, with multiple redundancies in place.

- The tracks *are* failing in certain places.  There's a bridge in Africa that gets called out as failing in one episode.

Even with all that it is not particularly realistic that a track would survive for more than a few months in the conditions we see, but a perpetual motion train is also not realistic.  Ultimately this just reinforces the idea that the snowpiercer is a house of cards, where eventually *something* will fail and everyone will die.  We're just watching doomed survivors hold on as long as they can.  >!Although the end of the series is also a bit more hopeful than the movie!<