>>1123550The Alaska Railroad is considered a redheaded stepchild, as it is completely isolated from the North American Rail Network with no other lines connecting to it.
The White Pass & Yukon, another Alaska-based line that also goes into parts of Canada, is similar in this regard. It has been able to survive as a tourist railroad, as its terminal in Skagway is a major port for cruise ships. You can disembark from your ship and board the train on the same pier.