When you go into the interior of the Class 313 and 314 you hear an ambient sound that almost sounds like the echo of water dripping. You can also hear it in the livery editor. I was wondering what the heck that sound really is because it’s been driving me crazy because I have no idea what it could be
Look up the Armstrong Powerhouse version of the class 313 and 314 since sounds were taken from that. It's not labeled but it's most likely the ticking spiral valve or whatever it's called which is what the train sounds like. Sounds are from an actual train.