Federal investigators are looking into the collision of two MBTA trains this weekend.
Some MBTA commuters had a change in their commute on Monday, with shuttle buses replacing service on parts of the D and E branches of the Green Line following a weekend crash in Somerville over the weekend.
Shuttle buses replaced service Monday morning between North Station and Union Square and Medford/Tufts, amid the federal investigation into the crash.
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Train service resumed midmorning on both branches.
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The crash happened at East Somerville station early Sunday morning. A passenger reported a neck injury, and was taken to the hospital along with all four Green Line operators.
According to the MBTA, a Green Line train collided with an out-of-service train, causing two cars to derail.
The incident sparked a response from the NTSB, which said Sunday it was sending a team to investigate the collision.
People were shocked by what they saw the by the damage caused by the crash.
"That train is like completely destroyed," said Somerville resident Robert Avery.
"The MBTA apologizes to Green Line customers who are impacted by the disruption in service, following a late night incident involving two trains," the agency said in a statement.
