I was watching the show Snowpiercer on Netflix and it’s basically about about the last of humanity in a train that is constantly moving on tracks around the frozen earth. The earth temperature average is $-133^\circ\ C$. They say if the train stops moving (comes to a full stop) they will freeze to death within $13$ minutes if they don’t get going again.
My question: is there some sort of theorem or physics law that states you need to be moving X fast in order to avoid freezing at this temperature? I tried to search this but I am no scientist so I don’t have the proper knowledge nor terminology. Thank you.