The basic website: www.akrr.com will show you the various routes of Alaskan trains. Hope this helps! We wanted to take the train but our flight did not fit the train schedule and so we are renting a car in Anchorage and returning it in Seward. Hertz is the only company that will allow a drop-off in seward. Good luck and have fun!
Are you going on your own with the Alaska Railroad or through the cruiseline? If the latter, which cruiseline? The train depot is near Ship Creek in Anchorage and the normal run to Seward departs about 6:45 AM. Most cruiselines don't travel to Seward until about 11:00AM. This is about a 5 hour trip.
Don't know if that answers any questions, but it depends on how you made your reservations.