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Why should Shenzhen Metro longhua line be handed over to MTR for operation?

According to the information I have learned, I can combine two aspects:

1, Shenzhen invited MTR to invest when Line 4 was just built. Since there is investment, there is management right.

2. The service level in Hong Kong is relatively high. The cooperation with MTR is to learn from other people's service management mode, as well as the exchange and reference of subway traffic between Shenzhen and Hong Kong, so as to make the future cooperation more perfect.