We were in the Captain's Lounge and couldn't hear them in there, but our friends were outside and everytime I walked out to talk to them later in the day, she'd say, can you hear that? It ended up being those luggage trains like you say. There was lots of luggage when we went to get ours. Then when we walked outside to leave at 8:30 or so, there was a huge line at the main entrance to the dome, apparently the folks who got off the ship earlier before they found the sick woman and shut the whole thing down. I've seen a few posts on FB about people who left their luggage there and were worried about it. One older guy we were talking about needed his meds from his luggage, bad idea, never pack that kind of stuff in a checked luggage.