Whenever I hear talk of bullet trains coming to the US, I hear people say things like "Americans could easily build better trains than the Chinese." Then I remind people that they have 20,000km of track, 150 trains and how much operating experience? That's a huge head start.
Even for US high speed rail, I don't think any of those trains will be designed by an American company. From Wikipedia: In February 2015 nine companies formally expressed interest in producing trainsets for the system: Alstom, AnsaldoBreda (now known as Hitachi Rail Italy), Bombardier Transportation, CSR [China South Rail], Hyundai Rotem, Kawasaki Rail Car, Siemens, Sun Group U.S.A. partnered with CNR Tangshan, and T…
It takes a while before you can start building rolling stock domestically. Melbourne just started making their class E trams a few years back, which they tout as being "made entirely in Victoria" and yet they've had the largest tram network in the work for decades.