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WMSC cites procedural gap after false loss‑of‑shunt alarm; continues close oversight of ATO and 8000‑series certification
Summary
WMSC staff traced a Feb. 20 false loss‑of‑shunt alarm to a temporary RTU configuration and urged WMATA to require personnel making configuration changes to verify control‑center status before leaving. The commission reiterated sustained oversight of ATO station overrun trends and of WMATA’s 8000‑series railcar safety certification work.
WMSC systems engineering staff described a Feb. 20, 2026 incident in which a red‑signal overrun near West Falls Church triggered WMSC review and a parallel Metro investigation. Investigators determined there was no verified loss of shunt; instead, alarms were caused by a temporary configuration applied to a remote terminal unit (RTU) during prework that affected how track‑circuit information was reported to monitoring software.
Paul Smith, WMSC Director of Systems Engineering, said the apparent loss of shunt revealed a procedural gap: personnel performing configuration…
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