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WMSC grants ATO concurrence systemwide but flags station overruns, tracks fixes and AWIS delays
Summary
WMSC concurred with WMATA to expand automatic train operation systemwide but staff reported persistent station overruns, identified mitigations (third-rail and marker-coil work, speed adjustments, software fixes), and noted delays in deploying the automatic wayside inspection system and pending 8,000-series documentation.
The Washington Metro Rail Safety Commission told commissioners on Aug. 19, 2025, that it has concurred with MetroRail's activation of automatic train operation (ATO) systemwide but remains closely monitoring station overruns and several safety-certification projects.
WMSC staff reported that the commission concurred on May 20, 2025, to use ATO in passenger service on the green and yellow lines and on June 12, 2025, to expand ATO to the blue, orange and silver lines; ATO passenger service began on June 15, 2025 for the blue, orange and silver lines. The commission said monitoring focuses on station-stop accuracy, trends, and the durability of mitigations WMATA has implemented.
Paul Smith, WMSC director of systems engineering, reported line-level overrun counts since activation: red (322 overruns, longest-running ATO), silver 93, orange 88, blue 53, yellow 54, green 45. For a July 1'Aug. 1 window, staff reported silver 53, orange 45, red 34, blue 28, yellow 17 and green 15 overruns. The staff presentation identified Minnesota Avenue (orange line) as a hot spot (17 overruns in a reviewed period).
WMSC and WMATA have pursued several corrective actions to reduce overruns: third-rail end-approach alignment adjustments (observed at Smithsonian Station), repositioning marker coils with a maintenance jig to improve alignment, railcar original-equipment-manufacturer software and hardware support, operator retraining and compliance checks, and temporary speed restrictions at certain platform approaches (WMATA has converted some of these to permanent reductions where effective). WMSC staff said that since WMATA adjusted the third-rail end approach at Smithsonian on July 23, there have been three station overruns at that location; prior to that adjustment, WMATA had reported 18 overruns across the three recently activated lines at that site.
Smith also outlined other certification items: the automatic wayside inspection system (AWIS) remains delayed by calibration, power and technical issues; AWIS will provide back-to-back wheel measurements to detect wheelset alignment problems that contributed to the 10/21/2021 7,000-series derailment, but the project currently has 25 outstanding safety-review items that "must be addressed before the system can be safety certified." WMSC staff will attend AWIS training to observe data collection and processing.
On railcar design, WMATA has submitted preliminary safety-certification documents for the 8,000-series railcars; WMSC staff said they requested the full preliminary design review package and will provide feedback by a stated August deadline (materials were not yet received).
Smith said WMATA is also pursuing software changes that move key antenna and calibration data from volatile memory to nonvolatile memory on certain railcar series to improve antenna performance and stopping accuracy. The WMSC said it will continue weekly data meetings with WMATA and evaluate whether additional conditions are needed to keep operations safe.
"We will continue to analyze the data, track the results of mitigation measures, and determine whether additional safety conditions are necessary," Smith told commissioners.
