Of course, there are many unanswered questions. The question of funding for the massive project remains unresolved, and there is the small matter of building a railway link all the way to the easternmost extent of Russia's isolated Far East, over thousands of kilometres of tundra. (The Trans-Siberian Railway does not come anywhere near the sparsely populated region, though a branch line to Yakutsk, a fraction of the way, is due for completion by 2013.) And, of course, US approval for a railway tunnel into its territory is still an open question.
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