This Wendover Productions video "Why China Is so Good at Building Railways" https://www.youtube.com/watch?v=0JDoll8OEFE https://www.youtube.com/watch?v=0JDoll8O

This Wendover Productions video "Why China Is so Good at Building Railways" https://www.youtube.com/watch?v=0JDoll8OEFE https://www.youtube.com/watch?v=0JDoll8OEFE also explains a lot about how things have changed recently to make this migration even more possible in China. They've built so much high speed rail in the last decade that they now have more than the rest of the world, combined. Hong Kong to Beijing is under 9 hours, while comparable distances in other parts of the world are over 40 hours.