diane charvat has added a photo to the pool:
We were on the Blue Line going to downtown Chicago from O'Hare, when we decided to get off at the California station. We walked in the alley where the train "L" ran. One side is the backs of houses, the other side is the backs of businesses. Most of the back sides of the businesses have graffiti, or street art. We heard that they did this for the train folks.
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