The Atlantic Avenue Tunnel is officially the world's oldest subway tunnel, built in 1844 by the cut-and-cover method under a City of Brooklyn Street. It is a half-mile long and accommodated two standard gauge tracks. The tunnel was built in only seven months, using only hand tools and primitive (by today's standards) equipment. It was built to provide grade separation for early Long Island Rail Road trains that lacked brakes good enough to operate on city streets, and to eliminate vehicular and pedestrian traffic conflicts and delays. This route allowed through trains to travel quickly between Brooklyn and Boston (via...
Though probably not sanctioned by the MTA, this "Service advisory" definitely conveys the increasing public sentiment in light of recent service cutbacks and double fare increases by the NYC Subway system, NYC Transit and the MTA.