How does the author use foreshadowing in The Far and the Near?

From his train cab above the tracks, he has seen several accidents where single people and families with children were hit by the train. The expressions on their faces as they realize, immobilized with fear at the train bearing down on them, haunt him. In this context, the unstoppable train rushing toward the victims suggests an abrupt confrontation with reality that cannot be avoided. It is a strong foreshadowing of the engineer's own shock when confronted with the reality of the town and the women in the little house.