Twenty-three people were taken to hospital with non-life threatening injuries after Friday night’s crash, according to a Tweeter from the Boston Fire Department.
The authority later said 25 people had received treatment.
It said the collision involved two Green Line trains on branch B near Babcock Street.
“We take this matter very seriously and are actively investigating the incident to understand what happened and prevent it from happening again,” MBTA said. in a tweet.
“The train was stopped at the light when it suddenly moved forward,” passenger Brian Sirman, who was on one of the trains, told CNN affiliate WCVB. “It was like the worst amusement park ride you could imagine, just shaking you forward.”
A witness who was sitting in a car when the crash happened told CNN affiliate WBZ that some passengers appeared to have neck and head injuries.
“So there was a woman getting off the train, and she had a lot of blood running down her face,” the witness said. “I had towels, so I gave him towels.”