I note that, just to connect Alaska to the rest of the North American railroad network, over 1000 miles of track must be built. In a part of the continent that is sparsely populated. This 1000 -- 1500 miles would have to be built, over some challenging terrain, and then another 2000 miles would have to be built in order to cross the Bering Strait and connect to the Russian railways. The costs, combined with the marginal prospect of financial returns, Make this project either a "Moon program" -level national unifier, or a complete non-starter. I think we might see the Alaska connection, but no trans--Bering Strait Tunnel.
Never gonna happen, dear readers.
Never gonna happen, dear readers.