I got distracted with the first video by asking myself "oooooo, what are those things with flashing lights under the baseboard - do I need any" ;-)
Then the little magpie dropped off my shoulder and I concentrated on the sounds. Seems to me that the "sound off" background noise (ie train running on track) seemed pretty much the same in both videos but with sound on tended to obscure the actual train noise - cutting across the same frequencies. What I'm trying to work out is whether that is the case in reality - you hear a generic train noise which, as it closes, becomes a more defined series of mechanical patterns.
Not sure I'm tempted by sound yet...