| The most dangerous materials transported by rail are toxic, inhalation hazard chemicals. Described
by homeland security as “weapons of mass destruction,” they are uniquely deadly and susceptible
to terrorist attack. Any intentional or accidental release of toxic gas in a population center has the
highest potential of being life threatening.
The manway area (where all the valves are located) is the source of almost every release. The existing manway housing cannot contain releases or prevent unauthorized access to the valves. Release of gas from a single valve can create a toxic gas plume covering a distance of more than five miles, potentially killing or injuring thousands. Secondary containment will prevent such releases and save communities the huge costs associated with emergency response to toxic spills. |