When I first started using the subway on my own in 1997, I remember trying to navigate from the Herald Square station turnstiles at 34th and 6th Ave to Penn Station for the very first time.

There was a modern sign, white letters on a black background, at the time, that said "Penn Station" and "MSG" among other destinations that pointed me down the corridor towards 33rd street. The only thing I found there was the handicapped elevator, and stairs up to the Manhattan Mall.

I remember this being very odd once I realized that the sign had turned me AWAY from the 34th street staircase that would have pointed me to the most direct route to Penn Station, one block away at 34th and 7th aves.

Later on, I learned about the existence of the Gimbals' tunnel, and it seemed that the sign did not know of the tunnell's closing. This could correspond to the information provided by an above commenter, who says that the closing of this tunnell was neve made official.