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Train derailment closes southbound I-5 south of DuPontAvoid southbound I-5 south of Tacoma. Southbound I-5 at Mounts Road at the Pierce-Thurston County line will remain closed for an unknown amount of time. Travelers should plan for a long-term closure and make alternate plans for at least the rest of the day. Expect significant congestion on alternate routes. Sign up here for email updates.