There's a great story I've uncovered (somewhat) in my research for a club history of Brae Burn Country Club in Purchase, NY.
For years it was known (plainly visible in spots) that the original property had a rail line going through it, right through the heart of the course. Stone tressels are still visible on #s 15 and 17 and the entire 5th tee was a raised rail bed, creatively deployed for its golf purpose by architect Frank Duane in 1963, when he routed the course.
After some looking I discovered that what this was, was the "Westchester Northern Line," a proposed unit of the Boston-Westchester line, that was to take passengers (and run freight occasionally) from White Plains to Pound Ridge, NY where spurs would divide for Danbury, CT and Brewster, NY.
The rail may have gotten under way as early as 1912, perhaps as late as 1915, (I'll track down that discrepancy by another means) but was halted in 1925, as the project's resources and intents were diverted, as the automobile came into greater and greater use, and the project abandoned.
The Brae Burn portion of this "Ghost Railroad" - which never saw a passenger, was likely the only portion ever built. Also interestingly, the proposed Westchester Northern line had land organs buying up rights of way and easements up through Westchester, some of which still exist and one of which exists right in the SE corner of Tamarack Country club, right near their 10th green, 11th tee, 12th green (their Biarritz).
cheers
vk