I read this book one time that was set during (I think) segregation, and a black girl was new to the town or neighborhood which was predominantly white. There were trains that went through the town or just at the edge and one day a baby or small child was on the tracks and the girl ran and grabbed the baby before the train hit. I think there was also a part in the book about one of the guys in the town jumping off the bridge to kill himself? I also remember it was a shorter book.
Lost Classics of Teen Lit: Name That Book! 