Dispatch from Chicago's Union Station

I was wandering around, sleuthing as it were. Some sort of computer malfunction was creating noise in the background. Kept repeating "Track number [mumble mumble] Track number..." It had been playing since we got here Sunday. Finally, with some fine detective work on my part, like asking a guy in a uniform...

I asked what the white noise was--"I don't hear anything but the track announcements for blind folks..."

I walked by and, sure enough, as you pass by, the voice tells you what track you are at. If you can hear, you can find your track...