The worst part is that the US hasn't built good train cars in so long that they don't have the expertise anymore. So as soon as the factory closes shop (after building subpar train cars due to american inexperience), they have to send the cars back to south korea for repairs when the welding is inadequate. No one from the factory that made them is working there anymore, and they don't iterate on their existing designs to kinda cement that knowledge and improve the quality. So building trains in the us is expensive, slow, and bad.

Meanwhile, China and Spain are building all the trains.