While US infrastructure continues its slow but steady degeneration as politicians stay fixated on richer people paying less taxes and thus starving the government and making it unable to maintain even what we have now let alone make ambitious plans for improvements in the future, we have to look to other countries for the nice things that we cannot have.
One example is the new super-fast maglev train that Japan has unveiled that travels at more than 500 km/h. You can see a video of its journey as it breaks the 500 km/h mark. Japan has had experimental trains that run even faster (at 580 km/h) but those were on shorter test tracks. This run was still a test run but with regular people as passengers on a 42 km trip between two cities, so a lot closer to commercial use. Meanwhile China is building an entire network of high-speed trains that span that vast country and has commercial trains that routinely run at 300 km/h.
But what the US spends its money on is not on improving the lives of its people but on building warplanes, warships, bombs, and soldiers. The ability to wantonly destroy other nations is where we like to invest our resources.