I really can't help you with the car rental, but I can tell you about the railroad. The rail ride is spectacular. The sights that you see along the ride are wonderful. The train is frequently riding above sttep high cliffs, raging rivers, beautiful valleys, etc. We took a bus up into the Yukon and took the train back. The bus ride up was nice, but I can't really say that it was spectacular. Lots of lakes and small towns. I can't imagine that renting a car would be much different. There aren't many roads around there. So, as I said, IMHO the train ride is the way to go. Enjoy the trip to Alaska. There is nowhere like it in the world. :wink:
Howard