What did the train noise represent in the outsiders movie?

Answer 1

The train and its whistle appear in the movie every time there is approaching danger. You'll hear it in the park before Bob's death, in the vacant lot when Ponyboy determines he's late getting home and will have to face Darry, and so many other times throughout the movie. Since S. E. Hinton wrote about "the greasers who live on the wrong side of the tracks," the train has played an important role in the novel and the movie. The train gives Ponyboy and Johnny a way out of the city when they run away to Windrixville, as well as the soundtrack for danger.