It costs money and time to build HSR. Fine. The J(N)R director who ran the shinkansen project literally lied to multiple levels of government to shield the (2x+) budget overruns. He resigned and then within a year of it opening he was given a medal for extraordinary contributions to Japan.
> Because nationwide high speed rail isn't as easy - or practical - as you think.
Who is claiming that it is easy? However, it is practical! It takes 6 hours to drive Tokyo to Osaka; it's 2hr by train. Trains leave every 5 minutes.
A west coast HSR network is just obviously practical! Beijing-Shanghai HSR is 1300km; SF to Seattle would be the same. It'd be 4-5h on a train. Right now it's 2.5 hours on a plane plus a recommended 1.5 hours for security and boarding plus transfers on each side--I'd rather take a high speed train If I could! SF to LA could be ~3h. 90 minutes on a plane plus lead time and transfer times and it's competitive. Again.
> There are US states similar in size to EU countries with comparable rail networks.
Oh, which ones?