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acoustical adjacent Aerial Structure Airborne noise Ambient Noise Levels barrier bentonite building Caulking CCTV Central Control Chicago Transit Authority Clearance Code communication concession areas concrete construction Electrical electrical substations emergency lighting entrances environment escalators evacuation exceed exit exterior fans feet flange floor graphics Grommets groove Grouting guidelines Horizontal Illumination Levels installed Insulated joints load located maintenance materials maximum minimum National Electrical Code neoprene noise and vibration noise criteria noise levels normal passageways passenger station police Port Authority Trans-Hudson protection public address system Rail Profile ramp rapid transit rapid transit system residential right-of-way safety Section segments signs sound level sound level meter space Specifications speeds Stairs Standards station platforms Steel subway Superelevation surface telephone Toronto Transit Commission track Trackwork traffic train operation Transit Authority transit cars transit facilities transit patrons transit vehicles tunnels turnstiles underground vent shafts walls waterproofing waterstop Wire and Cable