There are 2 things I don't like about this photo. One is the color of the sky is pretty white. The other is that the train is almost out of the frame. I'd have liked to seen it on the left side of the frame traveling right. I like the idea of this photo and the flowers give some nice colors as do the trees.
If the train had been more prominent in the shot, I think it would have made for a greater juxtaposition to the peaceful street around. You really have to go looking for the train to know at a glance that it's a rail bridge (unless you're from the area, which I'm not). I think the positioning of the shot is otherwise spot on.
Nice sunny day in Chicago. Had to search out the train. Would have been nice to have it more of the "subject" of the photograph. You've got some nice colors and crisp detail.