It's currently called the Greenbelt Walkway.
"The city of South Portland has been a state leader in bicycle and pedestrian trail development. The first trail developed within the City was the Spring Point Shoreway Trail back in 1979. Soon after, the City obtained the deed of an old railroad bed that once served as the supply route for the World War II Liberty Shipyard located near Bug Light in South Portland. During the mid 1980’s the City developed the rail-line into an 8-foot wide to buy 2.2 mile long paved pedestrian path. Over the last five years, the Maine DOT has provided the City funding for further trail development. This funding has constructed an additional mile of trail, and paved another 1/2 mile of trail. The funding allocation was important because it allowed for two gaps in the trial corridor to be closed, creating a single contiguous trail corridor. In the spring of 2004, the City reached a milestone by paving the last 2.0 miles of trail corridor, extending west to the Town of Scarborough. The Greenbelt now provides 5.7 miles of off-road trail from the town of Scarborough to Bug Light Park in South Portland."
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and just recently:
"As the Greenbelt Walkway winds around near Muzzy Street, there is a piece of railway that was once part of a longer rail line used to move goods to factories in Mill Creek before World War II, Reinhold said.
City Councilor Tom Blake was leading third-graders on an interactive tour of the greenbelt several years ago and pointed out the railroad. Eberle said that planted the idea to uncover and restore the section of rail."
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