As its investigation continues into the deadly June 22 crash of two Metrorail cars in suburban Maryland near Washington, D.C., the National Transportation Safety Board (NTSB) is urging the Washington Metropolitan Area Transit Authority (WMATA) to incorporate enhanced safety redundancy into its train control system as quickly as possible. The agency also called on the Federal Transit Administration to advise other transit agencies using similar automated controls to evaluate their systems for adequate safety redundancy. Metrorail's control system, which automatically regulates train speed and location, has come under scrutiny after a train traveling at high speed rear-ended a stopped train,
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