High speed rail is not coming to the US in any sustained system, except perhaps in California.
Why? The USA missed its chance after World War II, when it had the capital and its rail corridors could have gotten the width they needed for freight and passenger trains on their own tracks. If the US tried to make room for high speed rail on the west and east coasts today, it would cost hundreds of billions. Of course, the US is still spending $2 Billion a week in Afghanistan. So I guess we can't afford it.
In France, Germany Japan and China, where four of the world class train systems are found, the high speed passenger services were built from scratch, not piggybacked on an old, existing, mostly freight rail system. A world war helped, and that included a lot of bombing by the US and UK. But I don't think that's any excuse. The USA remained a wealthy nation through the space age. Just look at what happened to Penn Station. The French National Rail Corporation would die laughing if it ever got a good look at Penn Station and Amtrak. After all, France is a first world country, while the United States barely qualifies as a banana republic. And I wrote these words before news came out that the state of New York is considering yet another private company to manage the crumbling Penn Station.
This ties into the bigger, more obvious issue that mass transit in the US is generally terrible. The underlying reason is the same: the best chance for planning and funding was in the last century (either before the 1920 crash, or just after WWII). In my father's day, New York City took care of it's essential infrastructure. The automobile had not yet become the dominant means of transportation, and Robert Moses had not yet rearranged the city to accommodate millions of cars. Now, after decades of neglect, the bill is coming due. I hope the city gets the help it needs, because it's approaching a dangerous tipping point.