Rail

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

Former Santa Clara VTA chief hired to oversee Honolulu rail project

Michael Burns will be responsible for overseeing the rail project’s finances, as well as the functioning of the Honolulu Authority for Rapid Transportation board.

Alstom to extend Algeria's Constantine Tramway

Alstom, which will extend the tramway by 6 miles, will supply the integrated system, tracks, catenaries, telecommunications and signalling, substations and ticketing equipment.

$8.2B invested along 20 miles of Valley Metro light rail

Economic development within one-half mile of the system has been stimulated by ridership that has exceeded original projections. Valley Metro began compiling development activity since construction started in 2005 as part of an economic development database.

Alstom to deliver 17 trains to Algeria

The Coradia Polyvalent for Algeria is a dual-mode train (diesel and electric, 25 kV) able to travel at speeds up to 99 mph. The train has six carriages and provides capacity for 265 passengers.

Fla.'s TriRail adds bike car

The new bike car contains 14 racks that will provide more room to maneuver bicycles on and off the train. A set of seats were removed from the lower level of the vehicle to make room for the bike racks.

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

TruckingInfo.com

THE COMMERCIAL TRUCK INDUSTRY’S MOST IN-DEPTH INFORMATION SOURCE

Work Truck Magazine

The resource for managers of class 1-7 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