The Green line is a rapid transit line in Taichung as part of Taichung Metro. The line was briefly opened to the public on 16 November 2020, but has been closed since 22 November due to faulty couplers on the trains. The line officially opened on April 25, 2021, becoming Taiwan's fifth rapid transit system in operation. Two extensions, one heading east and the other reaching south into Changhua, are also planned.