Personally, I'd blame California for American voters' distaste for subsidizing high-speed rail. They look at the massive budget (and time) overruns of California's celebrated high-speed rail, and say "I don't want that waste of money happening in MY state, funded with MY state taxes" and then vote against any proposed projects.

This is, of course, a massively broad generalization, and there will be plenty of voters who don't fit that generalization. But the average American voter, as best I can tell, recoils from the words "high-speed rail" like Dracula would recoil from garlic. And I do believe that California's infamous failure (multiple failures, even) to build the high-speed rail they have been working on for years has a lot to do with that "high-speed rail is a boondoggle and a waste of taxpayer dollars" knee-jerk reaction that so many voters have.