SOMERVILLE, MASS. (WHDH) - The National Transportation Safety Board (NTSB) released its preliminary findings from an investigation into last month’s green line train crash.

A train slammed into another one that was stopped on the tracks.

Federal investigators say the train was speeding and ran through a red light.

The NTSB determined that green line train was traveling about 32 miles per hour when it entered a 25 mile per hour zone.

Investigators say the train then went through a red stop signal before entering a 10-mile per hour zone at the East Somerville station where it collided with an out-of-service train.

Two passengers and four crew members were treated for non-life-threatening injuries.

T officials estimate the crash caused roughly $6.6M in damages.

A federal investigation into the crash is ongoing.

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