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Passengers walk into the subway Bundaran HI station in Jakarta, Indonesia, April 1, 2019. Indonesia's first subway line, known as Mass Rapid Transit (MRT), was officially put into operation after a free trial run. (Xinhua/Du Yu)

Passengers walk into the subway Bundaran HI station in Jakarta, Indonesia, April 1, 2019. Indonesia's first subway line, known as Mass Rapid Transit (MRT), was officially put into operation after a free trial run. (Xinhua/Du Yu)