Two DC Metro Trains Collide, Killing Passengers
by Judd WileyJune 22nd, 2009, 7:30 pm
Two Metro trains have collided in Washington DC, “striking with such force that part of one train was left resting on top of the other.” Several people are dead, dozens more are injured.
There is no excuse for this. The DC Metro operates on a Red-Green light system, which should be 100% error proof. If there is a train ahead of you on the track, you get a red light. When the trains moves on, you get a green light.
Beyond that, the area where the trains collided - the Red Line between Fort Totten and Takoma stations - is above ground on a slightly curving track, with plenty of visibility. There is no reason that the driver should not have been able to stop his train on time.
So much for the inherent superiority of the subway.
Update:
From the Washington Post:
During morning and afternoon rush hours, all trains except longer eight-car trains operate in automatic mode, meaning their movements are controlled by computerized systems and the central Operations Control Center. Both trains in yesterday’s crash were six-car trains.
Investigators will probably focus on a failure of Metro’s computerized signal system, which is designed to prevent trains from coming close enough to collide, as well as operator error, according to former Metro officials.
The system relies on electronic relays — about the size of a hardcover book — aboard trains and buried beside the tracks along each line. When a train gets too close to another train, the system is designed to automatically stop the approaching train. It should work regardless of whether trains are being operated manually or by computer.
Posted in Government Workers, Mass Transit, Subways, Traffic Accidents | 11 Comments »










