I doubt the US even has a say in these dissussions. Their intercity train system is mostly commercial to transport goods from coast to coast or border to border. Sparse availability of public trains means spending roughly the same on 48 hours train ride or a 1 hour plane flight. Building a single highway trough dessert heat of the Midwest is already a toll, but building a countrywide train system would, even if subsidized with the full military budget still be a nearly impossible task. Furthermore you have 50% of the population screaming to stop this socialist nonsense. There are enough examples of unfinished train sections that show what happens if money runs out.
And one might ask them self, how did the US get from cowboys and farms to the beacon of technical advancement? The answer is oil and slaves. They played dirty for 200 years and got ahead. So how does the entirity of Europe have a extensive network of rails spanning millions of kilometers? Was it because they where built before unions and labor rights were a thing? Turns out multi continental projects were mostly achieved through human suffering and disregard for safety. None of which goes nowadays to the same extend as back then. If a project isn't finished within one legislative period, why even start? Policaly you won't reap the fruits of your labor.
I know I'm exagarting, but the principle is simple. The early bird gets the worm. Europe has their trains and the US has their cars. Better to let each one figure out their own thing and then share the knowledge.