The Adirondack and St. Lawrence Railroad operated between DeKalb Junction and Hermon in St. Lawrence County, New York over a four mile standard gauge railroad. The Adirondack&St. Lawrence was founded by the St. Lawrence Pyrites Company on April 19, 1906, and shortly thereafter the line was opened. Not only due to a parallel railroad of the Clifton Iron Company, traffic was low and in 1925 the line was abandoned and torn up. Still today the right-of-way can be observed near DeKalb Junction.
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