Xiomary Cosme of Haverhill, Mass. waits for her bus at the MRTA 

Xiomary Cosme of Haverhill, Mass. waits for her bus at the MRTA station in Haverhill, Mass. Monday, Feb. 11, 2013. State officials urged commuters to take public transportation when possible. The MBTA's regularly scheduled service resumed Monday, but some trolley and commuter rail lines were experiencing delays due to signal problems and weather-related issues. (AP Photo/Elise Amendola)
Associated Press
Xiomary Cosme of Haverhill, Mass. waits for her bus at the MRTA station in Haverhill, Mass. Monday, Feb. 11, 2013. State officials urged commuters to take public transportation when possible. The MBTA's regularly scheduled service resumed Monday, but some trolley and commuter rail lines were experiencing delays due to signal problems and weather-related issues. (AP Photo/Elise Amendola)
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