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English Wikipedia[1] says "It is planned to open in 2029", a year with no month, so the day stands for the end of that year.Phase 1 of Line 28 runs 8.877 km with nine stations beneath Chaoyang's Central Business District, from Dongdaqiao to Guangqudonglu by way of Guanghualu, Dawang Lu and Beijing East railway station. Construction started in July 2021.
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