Jig and the American Man is at a bar trying new beer. Jig didn't like that everywhere they go they tried new things. The bar scene symbolic Jig doesn't like to try new things and wants to keep her baby.
Jig was explaining how the hills don't look like white elephants. She said only the coloring of the trees look like white elephants. The Hills symbolic something unwanted and useless.
The scene with the railroads explains where the couple is going to get an abortion. The American Man convince to get an abortion. The railroads symbolize the couple is going somewhere to get an abortion.