New York State Department of Transportation did an inventory in 1974 of all the abandoned railroad right of ways in New York State. They were published as typewritten documents, and so never existed as text on a computer. They're currently available as PDF files. But Google seems not to have found those files, which is no surprise, because they're hidden behind a search box. OOPS! I'm taking the liberty of turning them into HTML documents and reposting them on the web. They're a little rough right now, but you can take a look at them in their unfinished state.