None of the Amtrak rolling stock can really compare with the state-of-the-art high speed rail trainsets in that image though. Perhaps a better comparison would be, say, Siemens' facility for producing Velaro trainsets or Nippon Sharyo's Shinkansen-making factory: https://www.n-sharyo.co.jp/business/tetsudo/making/img-kouta...
The factories are really similar! Guess most factories are, but still, I figured there would be some major difference.
In fact, some of the shots of the Chinese train carridges without their aerodynamic shell look almost exactly like the subway cars. Cool convergent engineering
If OP was about an Amtrak factory this would be more comparable.