A Green Line train derailed at Boylston Station Monday night, according to an official with the Massachusetts Bay Transportation Authority.Officials said no injuries were reported, but severe delays affected the B, C, D and E branches of the Green Line.Regularly scheduled service resumed by 11 p.m.It's unknown what caused the derailment.

A Green Line train derailed at Boylston Station Monday night, according to an official with the Massachusetts Bay Transportation Authority.

Officials said no injuries were reported, but severe delays affected the B, C, D and E branches of the Green Line.

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Regularly scheduled service resumed by 11 p.m.

It's unknown what caused the derailment.