The MBTA's commuter rail was hit with delays as temperatures dropped into the single digits around southern New England.
Two inbound trains from Franklin and Haverhill were cancelled as well.
The delays came from mechanical and signal issues.
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Some riders vented their frustration about the delays on social media.
Meanwhile, a fire on top of a Green Line subway train in Copley Square was caught on video. The MBTA says it's investigating what started the fire in the train's brake resistor grid.