A.M. Edition for July 26. Fires set around France’s rail network have brought service on several high-speed lines to a halt on the day of the opening ceremony of the Paris Olympics. WSJ reporter Matthew Dalton says the disruptions could drag on for days. Plus, former President Barack Obama endorses Kamala Harris’s presidential bid. And U.S. authorities arrest a Mexican drug kingpin after he was tricked into flying to Texas. Luke Vargas hosts.
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