NTSB Member: Metro Didn't Reinforce Older Cars as Recommended
Tuesday, June 23, 2009; 1:21 PM
Federal investigators will focus on communication between operators, a possible failure of the signal or automatic operations systems and potential operator error as they probe yesterday's Metrorail crash that killed nine and injured scores more, an official with the National Transportation Safety Board said this morning.
Board member Deborah Hersman also said the southbound train that crashed into another train on the Red Line near Fort Totten was one of the oldest in Metro's fleet. Five years ago, federal regulators said that model car should be strengthened to better protect occupants in the case of a collision.
"We recommended to either retrofit those cars or to phase them out of the fleet," Hersman said. "They have not been able to do that and our recommendation was not addressed. So, it has been an unacceptable status."
Metro officials have said that it was not clear that attempts to make the aging rail cars more crash-resistant would be successful. Retrofitting would not only be expensive, but could create new problems with propulsion and other aspects of operation, transit officials said at the time. In addition, such retrofitting was deemed too expensive for the cash-strapped system, especially because the cars are due to be replaced as soon as possible, officials have said.
Metro decided it would phase out the old cars as it purchased new vehicles. But today, all the old cars remain in service and comprise about one-third of the Metro fleet.
The 33-year-old Metrorail system was designed with a fail-safe computerized signal program that is supposed to prevent trains from colliding. The agency's trains are run by onboard computers that control speed and braking. Another electronic system detects the position of trains to maintain a safe distance between them. If they get too close, the computers automatically apply the brakes, stopping the trains.
These systems were supposed to make yesterday's crash impossible.
But four years ago, in an episode eerily similar to yesterday's, the signal system briefly failed in the tunnel between Foggy Bottom and Rosslyn, forcing two quick-thinking operators to stop their trains manually to avoid a crash.
In the June 2005 incident, the operator of one train noticed that he was getting too close to the train ahead. The signal system was telling him the track was clear, but he hit the brakes. The operator of a third train on the line hit the emergency brakes on time, too.
Metro officials were stunned by the events, which they said at the time had not happened before, and launched an investigation. It was unclear last night whether they ever found a cause.
In yesterday's crash, it appeared that the operator of the train that crashed did not apply the emergency brakes, also known as the "mushroom." Experts said the train appeared to be traveling fast before impact because the force pushed the first car of the train on top of the train ahead. Witnesses on that train also reported that the train did not brake before impact.
There was no reason to think that the operator, whom Metro officials have identified as Jeanice McMillan, did not spot the train ahead of her yesterday. The weather was clear, and the trains were not in a tunnel.