The head of the Boston-area transit system has resigned amid operational disruptions and commuter frustration during a series of snowstorms that hammered parts of the east coast.

Massachusetts Bay Transportation Authority (MBTA) General Manager Beverly Scott wrote a letter to Chairman of the Board John Jenkins, saying she is stepping down effective April 11.  Scott however gave no reason for her resignation.

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Scott headed the MBTA, also known as the T in 2012 after managing transit systems in Atlanta, Sacramento and Rhode Island.

"I have been around 40 years. I have been through hurricanes. I've been through World Trade Center bombings, tornadoes coming ... 36 inches of snow, this ain't this woman's first rodeo," Scott said on Tuesday.

The outgoing MBTA chief said, she will use her last two months on the job to bring "normalcy" back on the T, following a series of service disruptions.  The worst was a complete shutdown of rail service early this week that affected hundreds of thousands of riders.

A day before she announced her resignation, Scott defended her decision to shut the MBTA trolly system down.

She blamed aging equipment  and the record setting snow that hammered the region for service disruptions.

"No question, much more remains to be done to achieve the modern, and first-class public transportation system that all want and deserve," Scott said in her letter.

Jenkins said he is shocked by Scott's resignation, whose three-year contract is set to end December this year.  The MBTA board will select a replacement for Scott.

"Be clear, this board has had no discussions at any time about her tenure as general manager," Jenkins said in a statement. "We hoped and expected that she would fulfill her three year contract, which ends in December of this year."

While he didn't call for Scott's resignation, Massachusetts Gov. Charlie Baker heavily criticized the performance of the T during the winter storms.

"There are a lot of people at the T who I know have been working extremely hard, but this performance is simply not acceptable." Baker said. "Once it stops snowing, we plan to have a long conversation with the folks at the T about improving performance," the governor added.

Baker's office said, the governor and Scott have yet to speak directly to each other since the winter storm barreled the region.

Tagsthe T, MBTA, Boston, snowstorm