Hundreds of thousands of upper middle class Chinese tourists go through the US each summer. In Yellowstone the tourist attractions and shops often include Chinese signage and culturally relevant products.
A subset of those tourists are notorious for causing damage in national parks, misbehavior with animals, and leaving trash everywhere. One of the more recent incidents involved a Chinese family bathing their dogs in the thermal springs in Yellowstone, ignoring the signage warning that the ground off the boardwalks is nothing more than a crust of dried mud with scalding hot water below. The majority tend to be respectful, but there's a growing resentment against the bad behaviors of the few that translates into tension and prejudice.
Anyway, if imagine that such a train system would be a good thing, making the transport of tourists both ways more economical, and forcing both countries to adjust culturally. Personally, I've spoken out against China in public to the extent that I would be denied entry, but I love that Americans have the opportunity to engage with the Chinese people outside the bounds of their government's control. More of that can't help but be a good thing.