Final answer:
In the given selection, 'break' means that the rails suddenly change direction and split into two directions, creating a junction or intersection.
Step-by-step explanation:
In the given selection, the word 'break' is being used to describe how the rails 'shoot parallel across the face and break just under Turtle Mountains.' Here, 'break' means that the rails suddenly change direction and split into two directions, creating a junction or intersection. This can be inferred from the phrase 'Home is the place they cross.'
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