MBTA Green Line train that derailed, sending several riders to the hospital, was traveling 36 mph in a 10-mph zone: NTSB

An MBTA spokesperson said the operator involved in the incident "remains out of service" during the investigation.

The NTSB revealed new details about the derailment, including naming several factors that may have played a role, such as speed.

The MBTA Green Line train that derailed near Lechmere Station earlier this month was traveling over three times the speed limit<a class="excerpt-read-more" href=" More

State Rep. Mike Connolly expressed concern about the incident, saying “it could have been much more catastrophic.”

The Green Line train that derailed at the beginning of October was going 36 mph in a 10 mph zone, a preliminary investigation shows.

The MBTA Green Line train that derailed near Lechmere Station earlier this month was traveling over three times the speed limit<a class="excerpt-read-more" href=" More

The train also passed through a signal requiring a stop before it hit a switch that was still in motion, according to the NTSB's preliminary report.

The train was going more than 3 times faster than it should when it failed to stop for a signal and derailed on a switch.

Speed may have contributed to an MBTA Green Line derailment in Cambridge, Massachusetts, that injured several people and snagged service for days at the beginning of the month, according to the preliminary investigative report released Wednesday.