Glad to be of service, we have used the train before, as you exit the dock gates and walk towards the station there is a small shop on the left that sells discounted train tickets. Might not be there anymore, it was a few years ago. But the train prices are cheap and the trains are pretty nice, and double deckers (see image). We are boarding on the 25th, so we will pop into Rome on the 24th.
So no longer in Vegas, it has changed a lot since I first visited in 1982. Been there a few times, did a video of changes https://youtu.be/YP0yrghanKY .
Hope to meet up on the cruise, if not have a great one.