The Massachusetts Bay Transit Authority announced it may take up to 30 days to restore full service after Winter Storm Neptune delivered another wintry blow to the region.

During a Monday evening conference call, MBTA general manager Beverly Scott said, "As long as we don't get hit with another storm like the last one, ," the Boston Globe reported.

Boston was not spared by winter weather, and the city received another 13 inches of snow from Neptune. It added to the 6 feet of standing snow already blanketing some places and pulled the city within striking distance of the snowiest season on record.

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"We’re about at 7 feet of snow in three weeks in the city of Boston," said Boston Mayor Marty J. Walsh. "This is historic. We’ve never seen this type of snow."

In the Midwest and New England, the story of Neptune wasn't only the snow– brutally cold temperatures also became a life-threatening issue. Wind chills in northern Michigan dipped to 40-below-zero or colder, and Buffalo, New York, saw its coldest temperature in nearly 20 years on Sunday night. The low temperature there late Sunday night, according to Weather Underground data.

At least six people were killed in road accidents during the storm. Three of those deaths, including a mother and her unborn child, occurred on Ohio roads, while a 7-year-old Indiana girl was killed in a car wreck on Saturday. Two more deaths were reported Saturday on the New York State Thruway.

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Late Sunday morning, with lake-effect snow falling on the back end of Neptune, a pileup involving about 40 cars occurred on Chicago's Kennedy Expressway, leaving 12 people injured , NBC Chicago reported. In Sparta Township, Michigan, a girl suffered minor injuries when her car hit an icy patch of roadway and she couldn't stop before driving into the path of an oncoming train, The Associated Press reported. The girl was the only person in the car, and the train's engineer was not injured in the collision, the report added.

Winds howled during Neptune, adding to the danger of the storm. Gusts as high as 72 mph were recorded in Michigan, and a 77-mph wind gust was reported near Fisherman Island, Virginia. York Beach, Maine, reported the highest snowfall total from Neptune; an additional 24 inches of snow fell there.

As the storm moved away from the U.S., Massachusetts Gov. Charlie Baker said concerns will shift toward keeping exhaust vents clear and removing snow from roofs to prevent collapses. There have been a number of roof collapses reported throughout the state, including the partial collapse of an apartment complex roof in Newburyport, Massachusetts, Sunday afternoon.

The Massachusetts Bay Transportation Authority said rail service would resume Monday at most underground stations, The AP reported. The agency, which has struggled to keep up with the massive snow totals of the last few weeks, to see if their route would operate as scheduled Monday.

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School superintendents in Massachusetts were spared the decision of whether to order more snow days, as school vacation was already scheduled for this week.

A woman walks through drifting snow in Cambridge, Mass., Sunday, Feb. 15, 2015. (AP Photo/Michael Dwyer)