OP-ED COLUMNIST Nearly five years ago, as Amtrak officials were hailing their new Acela train as "a giant step forward" for America and "the kind of rail system we've all been dreaming about for decades," a former Amtrak official named Joseph Vranich offered another perspective. "I say without equivocation," he told The Hartford Courant, "that the Acela program is turning into the world's worst high-speed program." I quote him now not merely because he was right, but because he offers a useful model for coping with the latest Acela fiasco, the shutdown of service because of faulty brakes. The passengers...