I found this interesting and perhaps you will too.  There may be a rail to trail conversation connecting Medfield to Needham by way of unused train tracks that go through the Needham town forest, Charles River Red Wing Bay  through many miles of woods in Dover.  This trail is away from residential areas but along conservation land.

This project is called The Bay Colony Rail Trail Project the website to follow: http://baycolonyrailtrail.org/

Also check out http://www.wickedlocal.com/medfield/news/x757554034/Group-working-to-convert-Bay-Colony-rail-line-into-trail

This is a Newton-Needham-Dover-Medfield Project which I think is a really great way to utilize this rail that is no longer in use along a beautiful nature walk, bike, or hike.  I love the idea.

The property is adjacent to the proposed Bay Colony Rail Trail Red Wing Bay DCR boat launch facility on the Charles River, off Fisher St. in Needham.

This picture is the Central Avenue, Needham bridge.

Pat Baker, Realtor, Green, ABR, CNS, CHMS - Coldwell Banker Residential Brokerage, Needham, MA and surrounding communities, luxury homes. www.patannbaker.com   617-435-3471