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No prior experience in building and operating high speed rail.
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Track standards must be much higher.
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Track must be completely secure from people and animals, and geology. This means high fences and shallow cuttings set far back from the running lines.
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The line can only be crossed by bridges or tunnels. No level crossings.
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Long distances pose issues in crew turnaround.
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Track must be as straight and flat as possible. North America has space, but also has geography.
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Reliable catenary power supply.
The Twilight / Fifty Shades of Grey gambit.