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English Wikipedia[1] says the line is "planned to finish construction and open between Baoshan Railway Station and Yierba Jinian Road in December 2027", a month with no day.Line 19 will run 46.2 km with 34 stations from Baoshan Railway Station to Hongjian Road through six districts, built to ease traffic on Pudong South Road and crowding on the southern end of line 8 and the northern ends of lines 1 and 3. The northern section from Baoshan Railway Station to Yierba Jinian Road comes first; the southern section follows in 2029 and the middle section in 2031.
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