When I visited China's city Chengdu back in 2015, there was a single subway line, and it was about less than 5 miles long. 8 years later, including 3 years in C

When I visited China's city Chengdu back in 2015, there was a single subway line, and it was about less than 5 miles long. 8 years later, including 3 years in Covid, this is what Chengdu's subway network looks like: http://m.cd.bendibao.com/news/123545.shtm#&gid=1&pid=1 http://m.cd.bendibao.com/news/123545.shtm#&gid=1&pid=1 It looks to me the problem is not engineering or technical but political. It's a shame that the US can't build any more, no matter what excuses we produce.