My experience with trains is that they are painfully SLOW. I can drive to Las Vegas in 4 hours and if I take the train I get there in 8. In Alaska they use those small float planes, but, then there'd be a luggage situation to deal with.
If we did a bus transportation from Whittier to Talkeena (for one night - spelled that wrong - sorry) and then to to Denali for two and then on to Anchorage for a day and then the flights we should be good. I will talk to the tour operator and see what they have to tell me. I am pretty good at notes and will type up the conversation.