WASHINGTON — Never before in the U.S. has there been such a push to develop high-speed rail, with Congress and the Obama administration providing funds and new programs that could ultimately get the trains up and running here as they are in other advanced countries.

But doubts remain about how to finance a world-class rail network, where to find a reliable revenue stream, and whether states can surmount legal and financial hurdles before time-sensitive grants disappear and the momentum fizzles.

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