This from the Massachusetts Department of Transportation (MassDOT) and the Massachusetts Bay Transit Authority (MBTA):

Advisory: Overnight Rail Work in Natick and Wellesley June 9-10.

MassDOT and the MBTA are undertaking federally mandated Positive Train Control (PTC) infrastructure installation which will increase the safety of commuter rail customers and would like to advise the community of upcoming overnight welding and rail work within the right-of-way along the MBTA Worcester Commuter Rail Line in Natick and Wellesley.

Due to the equipment necessary to perform this work, higher noise levels can be expected. Starting Saturday June 9 at 5am and overnight into Sunday June 10, 2018 until 5 pm, the PTC Systems Integrator Ansaldo STS USA, Inc. is scheduled to perform welding activities along the rail. The work will take place along the Worcester Line at locations in the vicinity of Marion Street in Natick, at locations in the vicinity of Wellesley College, on the rail line behind Linden Street (between Crest Road and Weston Road) in Wellesley, and on the tracks north of Route 9 in Wellesley.

Please note this work is being done only along one track and crews will return at a later date to complete the second track. For further information regarding PTC please visit: mbta.com/ptc. Thank you in advance for your cooperation. We appreciate your patience as the MBTA takes this important step in making the railways safer for customers with the implementation of the PTC program. Should you have any questions please feel free to contact the PTC program at 617-721-7506 or PTCProgram@mbta.com.