what new high-speed rail railways have opened in december?

Question

I've read on Wikipedia that new lines were supposed to open. Can someone who knows tell them to me? Thank you!

Gail · Answer

Like the rides between Haikou and Sanya, Tianjin and Baoding, Chengdu and Chongqing. They have high speeds available between these cities now.

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What new high-speed rail railways have opened in December?