Of the many symbols from the story, I feel that the main three are the hills, white elephants, and the railroad station. The theme is about how Jig sees the opportunity of keeping her child and having a happy life. The man in the story fails to see the possibilities and encourages her to go through with the abortion.
The hills symbolize obstacles that we must overcome, but they are not colossal mountains. This represents the fact that the girl's baby is a major complication in her life, but it is not the end and she will make it through. The hills are also permanent, this shows how settling down would be a must with a baby.
The element of white elephants is symbolic of the baby. The man said that he had never seen a white elephant before. This is because he is not open to considering the possibility of keeping the child and wants the girl to have the abortion.
The element of the railroad station is representational of being at the crossroads of life during a time of crisis. The American man and the girl cannot stay at the station indefinitely. They must make a decision of where to go