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Safety Recommendation Details

Safety Recommendation R-10-009
Synopsis: On Monday, June 22, 2009, about 4:58 p.m., eastern daylight time, inbound WMATA Metrorail train 112 struck the rear of stopped inbound Metrorail train 214. The accident occurred on aboveground track on the Metrorail Red Line near the Fort Totten station in Washington, D.C. The lead car of train 112 struck the rear car of train 214, causing the rear car of train 214 to telescope1 into the lead car of train 112, resulting in a loss of occupant survival space in the lead car of about 63 feet (about 84 percent of its total length). Nine people aboard train 112, including the train operator, were killed. Emergency response agencies reported transporting 52 people to local hospitals. Damage to train equipment was estimated to be $12 million.
Recommendation: TO THE WASHINGTON METROPOLITAN TRANSIT AUTHORITY: Establish periodic inspection and maintenance procedures to examine all audio frequency track circuit modules within the Metrorail system to identify and remove from service any modules that exhibit pulse-type parasitic oscillation.
Original recommendation transmittal letter: PDF
Overall Status: Closed - Acceptable Action
Mode: Railroad
Location: Washington, D.C., DC, United States
Is Reiterated: No
Is Hazmat: No
Accident #: DCA09MR007
Accident Reports: Collision of Two Washington Metropolitan Area Transit Authority Metrorail Trains Near Fort Totten Station
Report #: RAR-10-02
Accident Date: 6/22/2009
Issue Date: 8/10/2010
Date Closed: 4/5/2011
Addressee(s) and Addressee Status: Washington Metropolitan Area Transit Authority (Closed - Acceptable Action)
Keyword(s): Maintenance, Transit

Safety Recommendation History
From: NTSB
To: Washington Metropolitan Area Transit Authority
Date: 4/5/2011
Response: The NTSB is pleased that WMATA has added GRS ATP Module Parasitic Oscillation Test T-163 to its Automatic Train Control (ATC) Technical Procedures Manual, effective October 21, 2009, with testing required every 3 months. These actions satisfy Safety Recommendation R-10-9, which is classified CLOSED – ACCEPTABLE ACTION.

From: Washington Metropolitan Area Transit Authority
Date: 11/4/2010
Response: MC# 201000408: - From Richard Sarles, General Manager: As the NTSB is already aware, WMATA has implemented the testing of track circuit modules using test procedure T163 (enclosed). All Automatic Train Control (ATC) personnel have been trained on how to properly test the track circuits utilizing the new procedure. The "as directed" trigger of this test procedure was for the original system-wide sweep of testing for affected track circuit. WMATA has since revised the procedure to require testing in three (3) month intervals using essentially the same testing techniques; implementation of this revision is scheduled for November 2010. In addition to this test procedure, WMATA engineers also conduct twice daily Loss of Shunt (LOS) analysis of the ATC system to identify any track circuits which display parasitic conditions that are unacceptable to the functionality of WMATA's system. The LOS testing is scheduled to continue until the completion of the real-time alert system. The alert system is scheduled to be implemented before the end of the 2010 calendar year at which time an independent review of the system will be conducted.