BOSTON (AP) – A spokesman for the National Transportation Safety Board says no mechanical problems have been found on a Boston train that crashed into another Friday, injuring about 50 people.

The trolley driver told police he was texting his girlfriend before his train collided with a stopped train on the Green Line.

NTSB spokesman Peter Knudson said Sunday that no problems were found with the brakes or other equipment on the train that caused the wreck. He says the train was going 25 mph when it crashed, and that the stopped train was first visible to the moving train from 480 feet away.

All the injured passengers are recovering, and the Green Line reopened Sunday.

The trolley driver faces firing and possible criminal charges.

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