Oh gosh, lets see if I can remember it. What you will probably have to do is pick up your tickets and the train at the Liverpool Station in London. I don't remember them offering to do anything with our bags and we loaded them ourselves on our train. If this is to a cruiseship they often have 'special' trains that they place into service. Google "British Rail" and they should be able to give you the information. In addition you can sometimes just book through your TA as part of your cruise. We did our own and actually saved 50% AND beat the other train there as ours was non-stop but that was to Harwich.