It begins as a that you feel in your chest before you hear it with your ears. Far off, the metallic "singing" of the rails starts—a high-pitched, resonant vibration as the steel tracks transmit the kinetic energy of the oncoming locomotive. The Crescendo
As the train draws closer, the of wheels hitting rail joints becomes distinct, though in modern welded tracks, this is often replaced by a heavy, continuous roar . You might hear the periodic chime of a crossing bell or the sudden, sharp blast of the air horn —a sound that starts at a high pitch and drops as it passes (the Doppler effect). The Arrival
Understanding the Language of the Train Whistle - Strasburg Rail Road