One of the most telling clues that the operation is an abortion comes toward the end when the man says,
"You've got to realize that I don't want you to do it if you don't want to. I'm perfectly willing to go through with it [the pregnancy] if it means anything to you."
And later he says,
"But I don't want anybody but you. I don't want any one else. And I know it's perfectly simple."
The setting itself also gives clues that the couple is talking about a decision between productivity and barreness. On one side of the train station are fields of grain,trees, and water; on the other side, the valley is dry and barren. It is the dry side of the valley that the girl contemplates in the end, symbolizing the couple's decision to have the abortion so that things could be like they were before, as the man so claims.