Amazon.com: 100% Waterproof Stream MP3 Music Player with Bluetooth and Underwater Headphones for Swimming Laps, Watersports, Normal Cord, 8GB – by H2O Audio : Electronics
OBS: How to Record Game Audio Only
Gaugemaster GM781 Station (Steam) Scenic Sounds Module – Rails of Sheffield
Freesound - "small steam locomotive hiss and honk sound effect" by Garuda1982
Steam Train with Whistle And Hillside Echo - Sound Effects MP3 download | Steam Train with Whistle And Hillside Echo - Sound Effects Lyrics | Boomplay Music
Today I learned that Steam music player is able to find all sound files in game folders : r/Steam