The Alaskan Railroad is not Amtrak! To start with the guides are born and bred Alaskans with a very thorough knowledge of the route, sights, and energy. The cars and seats themselves are very comfortable and there's an enormous amount of leg room and the seats recline almost fully. Every train has a dome car -- which is a car with a 2nd level that has a domed room which affords an even more scenic view of the route. The domed car has rotating open seating with passengers encouraged to stay no more than 30 minutes so other riders can be afforded the same opportunity. The train also has a gift shop and a dining car with serviceable, affordable food. It's as easy to appreciate the scenery from the dining cars as from the regular seats.
The Seward Coastal Classic Route (from Anchorage to Seward) is stunning. The route runs through the Chugach Mountains and passes dozens of glaciers. If you're lucky you'll sight dall sheep and moose along the way. The Denali Star Route is not quite as picturesque but still beautiful and nearly as enjoyable.
The train isn't the fastest way to get point-to-point but is well worth it. For example, the train slows for unique picture taking opportunities which the guides point out well ahead in advance. There are opportunities to shoot tunnels, gulches, glaciers etc.
In summary, we had a wonderful time on the Alaskan Railroad. (There are coupons for free round-trip tickets from Anchorage to Denali, Anchorage to Seward, Anchorage to Whittier in the Alaskan Toursaver booklet -- available from toursaver.com for $99.)