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by namelost 3048 days ago
Chinese cities have grown tremendously large metro systems in a very short amount of time. China has 5 of the 10 longest metro systems, and 4 of them were started operating in the 90s or later. The Nanjing metro is the 6th longest in the world and was started running in 2005.

https://en.wikipedia.org/wiki/List_of_metro_systems#List

So the answer is a resounding yes, it is much easier to build metro systems than it was in the past. As long as you do so in China.