system
Given the following post, respond as if you're commenting on Reddit:
human
[Snowpiercer] Is there a reason the train has to circle the entire world?

 It seems that circling the globe leads to some problems, especially when dealing with mountain ranges. Would it not have been better just to run a circuit of some large flat bit of land like the West Siberian Plains or the American Great Plains? It would be more geologically stable and have no chance of avalanche.
gpt
If the train had been planned from the beginning as a lifeboat for mankind it probably would have been a more conservative route in a more ideal region. But the train was designed to be this grandiose marvel, hence why the train goes through mountain passes, tight winds, and other things that make great tourist vistas but add an element of danger to an already dangerous exercise.