The problem with the buildout of Chinese high speed rail, that the US won’t really have should it start investing into it, is that China already had a very robust passenger rail system
They WAY overbuilt their high speed system, and now tons of lines are hemorrhaging money because people are opting for the slower, but significantly cheaper, traditional rail system that the high speed one has to compete against
They don’t need it though, China already had a very robust traditional passenger rail network which is the primary reason many of these high speed lines are hemorrhaging money: people aren’t willing to pay the increased cost for a high speed ticket