We also have a strong first-adopter problem: our rail systems were among the first, so we're stuck with some inherent design limitations that weren't an issue in 1890 but sure are now.

For example, if you want high speed rail between major cites in new england, you're out of luck; the rails were laid out with curves and shapes that will not allow you to go fast. You can solve this, but the solution is to straighten out the rails -- and that means eminent domaining several billion dollars worth of Connecticut. I don't see that happening.