I don't see any justification for the Soviet analogy other than wanting to conjure up the image of the impending collapse of China. This sounds like the infrastructure version of the 'financial bubble' prediction that crops up every other year. If one wanted to pick a positive story there would be the example of the American progressive era, the creation of the interstate system, the railway system during the 19th ce…
Like the Soviet Union in the 1970s, China is coming to the end of a long labor-force boom, and hoping that an orgy of investment will keep the old magic going while stabilizing its fraying frontiers.
Cornelius Vanderbilt wasn't trying to overcome a graying America or shore up the Monroe Doctrine by building railroads in Latin America and Africa. If anything, I fail to see any justification for your comparisons between China and the progressive-era US.