Recommendation 8.31: Policies should be developed that allow only railcars with the IUs mounted and operating to move on tracks that pass through urban areas.

Implementation of this recommendation would require the participation of DOT, the national laboratories, the railroads, and the cities and the Conference of Mayors, and should be coordinated by OHS.

Flooding of Urban Tunnels

With the capability to quickly isolate vulnerable sections from the rest of the tunnel system, the flooding of urban tunnels could be mitigated. Such technology could also be used to isolate sections of the tunnels so that smoke, gases or other dangerous mixtures released there could not infiltrate other sections.

Recommendation 8.32: Rapidly deployable tunnel barriers should be developed and produced, and they should be installed at appropriate locations in transit and railroad system tunnels, so that they will deploy—automatically or on signal—to block the flow of floodwaters in the tunnels.

This should be a DOT/TRB research area, with strong support to be expected from the cities and the transit properties and railroad systems that have such vulnerabilities.


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