NTSB releases third D.C. Metro crash update

Posted on July 23, 2009

The National Transportation Safety Board (NTSB) announced that it continues to make progress in its investigation of the June 22, 2009, collision of two Washington Metropolitan Area Transit Authority (Metro) trains on the Red Line in Washington, D.C.

Factual information that has been gathered by the NTSB:

Two signal companies, Ansaldo STS USA and Alstom Signaling Inc., which designed and manufactured the automatic train control components for the Metro system, are providing technical assistance to the NTSB investigation.

As previously reported, an impedance bond (#15) for the track circuit where the accident occurred was replaced on June 17th, 2009, five days before the accident. Continued review of the maintenance logs has identified that the impedance bond (#14), located on the other end of the same circuit, was replaced in December 2007. Metro records reveal that this track circuit's train occupancy signal has been intermittently fluctuating since the replacement was installed in December 2007.

The NTSB has requested trouble tickets for the last 18 months to see if these problems had been reported, and seeking records to see if any operators reported problems on this circuit.

The investigation is identifying possible sources of interference affecting the automatic train control (ATC) operation. These potential sources include Electromagnetic Interference (EMI), traction power harmonics and signal crosstalk, communication lines, and system upgrades and changes.

Following the accident, Metro began to review operations data and identified some problems at other circuits. These anomalies are being examined by NTSB and Metro to determine if they are the same kinds of problems as were found in the location of the accident site.

Testing has identified that the circuit problems are occurring more frequently during the rush hour time period. As a result, the NTSB and Metro testing at the accident location on the Red Line is continuing. These tests may result in occasional delays on the Red Line in the Fort Totten area. All testing in the Fort Totten area is closely coordinated with Metro and is scheduled to minimize delays on that area of track during rush hour.

On Saturday, July 18, the NTSB conducted a sight distance test at the accident location. Information collected from the test will be correlated with rail markings documented after the accident, the braking characteristics of the striking train, and the speed information gleaned from the Metro Operations Control Center records.



View comments or post a comment on this story. (0 Comments)

More News

Bombardier to supply 4 more trams to Australia

The order is valued at approximately $18 million and is an exercise of an option included in a contract signed in 2011.

Texas' DCTA receives grant for A-Train Rail Trail

Once complete, the Lewisville Hike and Bike trail will run from DCTA’s Hebron Station all the way to the Highland Village/Lewisville Lake Station. Construction on the last portion of the Lewisville Hike and Bike trail is expected to begin in early 2016.

Metra prepares for winter weather with switch covers, heaters

Additionally, agency is continuing to repair and replace railcar doors that are prone to fail in winter conditions.

Alstom to supply Citadis trams to Lyon, France

The order, worth over $21 million, represents the exercise of an option on a contract signed in 2011.

XpressWest chosen to build Las Vegas-to-L.A. high-speed rail

The initial phase of the XpressWest project, which will link Las Vegas to Victorville, Calif., will cost $8 billion.

See More News

Post a Comment

Post Comment

Comments (0)

More From The World's Largest Fleet Publisher

Automotive Fleet

The Car and truck fleet and leasing management magazine

Business Fleet

managing 10-50 company vehicles

Fleet Financials

Executive vehicle management

Government Fleet

managing public sector vehicles & equipment



Work Truck Magazine

The number 1 resource for vocational truck fleets

Schoolbus Fleet

Serving school transportation professionals in the U.S. and Canada

LCT Magazine

Global Resource For Limousine and Bus Transportation

Please sign in or register to .    Close