http://gothamist.com/2008/06/11/coney_island_photog.php
I am only related to this story in that I have read it and I relate to it, having been hassled by cops, railroad folks and ordinary people to the point that I keep a copy of the LIRR and NYC Transit memos stating there is no ban on photography anywhere and Burt Krages excellent pdf file.
This stuff happens. Folks make up law as they go because while they may (or may not) be trained in enforcement, they have little training in law. Push the issue, call the cops, call your supervisor...I'll call the NY Press Photographers Association and the NYC Civil Liberties Union and most of all, take a snap of the folks who are harassing you. Blog it. And let them know it.