The ears work with the brain and other body parts through a series of steps that help you hear the sound of a train coming. What step must happen before your brain recognizes that this is the sound of a train moving? Your brain sends a message through the nerves to the muscles in your legs.
Your ears send a message through the nerves to the brain.
Your leg muscles pull on the bones as you move out of the way.
Your eyes pick up the sound waves as you see the train coming.