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50 Table 5. Role of MEC systems in case study incidents. Section Life Safety Power Command Title Ventilation Communications Number Systems Distribution and Control Moscow Subway 3.2.1 Suicide Bombing Jungangno (Chungang- 3.2.2 Ro) Subway Station U U U U Arson Fire 3.2.3 St. Gotthard Tunnel Fire F F Howard Street CSX 3.2.4 U Tunnel Fire Kitzsteinhorn Tunnel 3.2.5 U U Cable Car Fire 3.2.6 Mont Blanc Tunnel Fire U U U 3.2.7 Channel Tunnel Fire U U Subway Sarin Gas 3.2.8 F U U Attack Chicago Freight Tunnel 3.2.9 F F Flood London Underground 3.2.10 U U (the Tube) Station Fire BART Transbay Tunnel 3.2.11 U U U U Fire PATH Evacuation under 3.2.12 F F the World Trade Center A "U" indicates that a particular system or operation played an unfavorable role in the incident, and an "F" indicates that a system played a favorable role. A dash indicates that the accounts do not say anything specific about the particular system. There is a need to change or direct tunnel user behavior. 3.4.3 Role of MEC Systems in Case Study Tunnel operators must become more aware of four key areas: Incidents Operations (ventilation and smoke extraction); Infrastructure (direction of traffic, communication Although it is extremely subjective, Table 5 relates the case between tubes, and length of tunnel); studies to the MEC tunnel systems that are discussed in Section The sizes, types, and numbers of vehicles allowed within 4.5. A "U" indicates that a particular system or operation played tunnels; and an unfavorable role in the incident, and an "F" indicates that a Tunnel users (drivers' escape route and communica- system played a favorable role.A dash indicates that the accounts tions equipment). do not say anything specific about the particular system.