An investigation is underway after a Red Line train derailed near the Broadway station early Saturday morning, the second incident on the MBTA subway system in less than 24 hours.According to the MBTA, just before 6 a.m., the first car of a Red Line train derailed while utilizing a rail crossover near the Broadway Station in South Boston as part of a planned Red Line diversion.The diversion is in place as part of the planned Dorchester Avenue Bridge project, suspending service between the Broadway station and Ashmont and North Quincy stations, with shuttle buses servicing the stations impacted by the diversion.Due to the derailment, the planned shuttle bus service was extended from Broadway to Park St while MBTA personnel investigate the cause of the derailment and inspect the track before re-railing the train car.”With the safety of paramount importance, the MBTA is committed to identifying the cause, implementing necessary corrective actions, and keeping the public informed,” the MBTA said in a statement.This incident comes less than 24 hours after service along the Blue Line was suspended near the Orient Heights station after a failure of the roof-mounted pantograph on a northbound train caused the train to lose power just after 5 p.m. Passengers were evacuated from the train with assistance from MBTA personnel and Boston Firefighters and had to walk approximately 500 feet down the tracks to the train platform at the Orient Heights station. Repairs took more than six hours to complete before service was resumed along that section of the Blue Line.

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