The train from Freeport to Boston will be interrupted frequently as track improvements and maintenance begin Saturday and will continue through the middle of October according to Boston.com

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The article says the number of Downeaster trains that operate on weekdays will be limited, and passengers traveling to or from stations between Brunswick and Dover shoudl expect part of the trip to be operated by bus.

Downeaster fares will be reduced for passengers who are affected by the work.