Boston, Jun 2 (AP) A collision of two subway trains in Boston sent four employees of the city's troubled transit system to the hospital, officials said.

Both Green Line trains derailed in the crash around 9.20 pm on Wednesday, officials said. The subway system continued to experience service disruptions Thursday morning.

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A two-car westbound train carrying 20 to 25 passengers struck a two-car train without passengers as it was preparing to enter service at Government Centre Station, a Massachusetts Bay Transportation Authority spokesperson said.

Four operators were taken to Massachusetts General Hospital, and one was released Thursday morning. The nature of their injuries was not disclosed.

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No passengers were treated for injuries, the spokesperson said. One train has since been placed back on the tracks.

The cause is under investigation, and the tracks will be inspected to see if they need repairs before service can resume, officials said.

The collision comes amid a federal review of the MBTA's safety following several accidents that led to injuries or death.

A 39-year-old man died in April when he was dragged after his arm got stuck in a malfunctioning subway car door.

Nine people were injured in September when an escalator at a station malfunctioned, and more than two dozen went to the hospital in July when a Green Line train rear-ended another trolley. (AP)

(The above story is verified and authored by Press Trust of India (PTI) staff. PTI, India’s premier news agency, employs more than 400 journalists and 500 stringers to cover almost every district and small town in India.. The views appearing in the above post do not reflect the opinions of LatestLY)