Spot: Half-a-foot wide square rails on an incline, one of which never got knobbed. Way more dangerous than it looks. There might also be horse feces in front of it (see photo.)
Bust — ♦♦♦♦♦: You normally do not get hassled here.
Location: The Westside Highway / 12th Avenue and 36th Street (there are no cross streets back here, so 36th Street is an estimate.) Take the A, C or E train to 34th Street–Penn Station. Skate west on 34th Street until you hit the Westside Highway. Make a right, and skate up the parallel bike path for approximately two or three blocks. You should see the rails right by the car impound.
Pictures (Click to Enlarge):