No, the remaining rail line (now dormant) was an Erie line, last known as the Stourbridge Line. I do not have pictures of exploring the line, but I do have pictures of taking the train to Laxawaxen.
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The stone remains you are referring to was part of the canal system that transported coal on small boats. I am sure someone can describe it better, but in Honesdale they have a nice scale model of it in the museum. On my webpage there is a video picture slideshow of the museum and there are several pictures of the locks and canals from the model.
Taking the excursion they discussed the tow paths along the river, such a shame this excursion is no longer in operation.