The tracks of the Rockland branch have been hosts to the Maine Central, and Maine Coast Railroads, and the Maine Eastern Railroad, a subsidiary to the Morristown and Erie Railroad. They will now host the Central Maine and Quebec Railway, as a freight only operation, mostly shipping Dragon Cement's powdered limestone to the port of Rockland.
The tracks here in Wiscasset run right along the Sheepscot river with the town on one side and the river on the other, but the train only runs once or twice a week here.
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I have a power-point, Railroads of Southern Maine with pictures and directions to some of the other rail-fan sites. If your browser does not play it right try downloading it, and playing it in a PowerPoint program.
The Wiscasset Station is at 26-34 Water St Wiscasset, ME 04578 43.999792, -69.665097. Take a right off of US 1 north to get there.