Thats looks very interesting. Not sure how it might sound when the train is at a distant part of the layout, but the woofer is located near the cab operator.
I remember many years ago Noel Edmunds produced a railway background sounds audio cassette for Hornby. I used to play it on a continuous loop in the background when operating the layout many years ago when the children were young. Had lots of interesting background noises from steam trains shunting, passing with doppler effect, whistles, announcements, station platform noises, coach doors shutting, approaching steam trains with heavy chuff, flange squeal, guards whistles, clackety clack rail sounds, etc. Rather soothing to have at low volume in the background and added a certain atmosphere.