The shutdown marks the second major subway service suspension this August after the earlier Green Line shutdown.
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Orange Line service will be suspended between the Oak Grove and Back Bay stations from Aug. 20 to Aug. 30 due to track and signal upgrades, according to the MBTA.
The partial shutdown will be the second major subway service change this month after the Green Line shutdowns from Aug. 8 to Aug. 16. Orange Line riders will have several alternate travel options to choose from during the 11-day shutdown…