
According to the Baltimore Sun, companies have laid 30,000 feet of
emergency fiber to patch around the damage in the Howard Tunnel.

  "There was a ripple effect around the country with corporate networks
   due to this Baltimore disaster," said Frank Stanton, an executive with
   Lexent Inc., a New York-based company that repaired fiber-optic cable
   after the World Trade Center bombing in 1993. "Everybody thinks they
   have redundancy, but these type incidents show people there are huge
   issues. When you cross rivers and bridges, these choke points are the
   Achilles' heel." 

On the Washington DC to New York City fiber route, there seems to be
at least one train derailment leading to significant network traffic
re-routes every year.



