Saratoga and Sacketts Harbor RR. According to Dick Palmer, it was graded clear across Fulton and Herkimer Counties, and made it into Lewis County. Anybody know anything about this? It's on the 1854 McAlpine map of New York State.
UPDATE: no, he actually said it was NOT graded through the Adirondacks, but that it was graded in Lewis County. That makes more sense, since you can build a railroad faster by building from both ends.