Posted by Paul Matus on Thu Aug 2 14:27:24 2001, in response to 76th Street IND Station, posted by Joe Saitta on Thu Aug 2 10:32:20 2001.
Reading between the lines of your post, I don't see anything in what you have that shows that the line was actually built.
I had a little correspondence with Joe Brennan on this and at this point I have to agree with him that, in the absence of convincing evidence to the contrary (like a photo, or a reliable eyewitness) that this does not exist, except on paper.