SUBWAY ENVIROMENTAL SURVEY: MASSACHUSETTS BAY TRANSPORTATION AUTHORITY

THE ENVIRONMENTAL SURVEY OF THE (BOSTON) MASSACHUSETTS BAY TRANSPORTATION AUTHORITY (MBTA) SUBWAY SYSTEM WAS UNDERTAKEN AS PART OF A LARGER INVESTIGATION TO DEVELOP COMPREHENSIVE SUBWAY ENVIRONMENTAL DESIGN CRITERIA, AND FOCUSES UPON CONDITIONS PREVAILING AMONG THE MAJOR OPERATING PROPERTIES THROUGHOUT THE NATION. THE EXISTING MBTA SUBWAY SYSTEM WAS CONSTRUCTED PRIOR TO WORLD WAR I, AND ENVIRONMENTAL CRITERIA USED IN ITS DESIGN ARE NO LONGER AVAILABLE. HOWEVER, TYPICAL HEAT AND AIR VELOCITY PROBLEMS WHICH PREVAIL IN OTHER OPERATING PROPERTIES ARE NOT EXPERIENCED IN THE MBTA SUBWAYS, AND OVERALL CONDITIONS ARE CONSIDERABLY BETTER THAN EXPECTED. TWO POSSIBLE EXPLANATIONS ARE: (1) MBTA STATIONS HAVE MORE ENTRANCES AND EXITS WITH LARGER OPENINGS, THUS PROVIDING BETTER NATURAL VENTILATION; AND (2) STATION SPACING IS RELATIVELY SHORT WITH GOOD VENTILATION IN BETWEEN TO PROVIDE AN EFFECTIVE AIR CIRCULATION SYSTEM. PRELIMINARY STUDIES OF CONVENTIONAL BUS TRANSPORTATION INDICATED THAT UNACCEPTABLE LEVELS OF SMOKE, ODOR, AND DIRT WOULD BE GENERATED WITHIN THE UNVENTILATED PASSAGES. LATER EXPERIMENTS USING BUSES EQUIPPED WITH CATALYTIC MUFFLERS REVEALED SUBSTANTIAL DECREASES IN THESE CONDITIONS, AND IT WAS CONCLUDED THAT UP TO 80 SUCH COACHES PER HOUR COULD OPERATE IN THE HARVARD STATION TUNNELS WITHOUT MECHANICAL VENTILATION. APPENDED MATERIAL INCLUDES: A SCHEMATIC DIAGRAM OF THE SYSTEM, TYPICAL TUNNEL CROSS SECTIONS, VENTILATION SHAFT DETERMINATIONS, EMERGENCY EXIT LOCATIONS, EMERGENCY FAN SCHEDULE, AND RAPID TRANSIT VEHICLE DATA (IE. PHYSICAL, GEOMETRIC, AND PERFORMANCE CHARACTERISTICS). /UMTA/

  • Supplemental Notes:
    • PROJ NO DC-MTD-7
  • Corporate Authors:

    De Leuw, Cather and Company

    165 West Wacker Drive
    Chicago, IL  USA  60601
  • Publication Date: 1971-9

Subject/Index Terms

Filing Info

  • Accession Number: 00242075
  • Record Type: Publication
  • Source Agency: Urban Mass Transportation Administration
  • Files: TRIS, USDOT
  • Created Date: Nov 7 1972 12:00AM