In Erie, Pennsylvania, union workers have agreed to end their 9-day-old strike at a locomotive plant—the largest work stoppage at a U.S. factory since Donald Trump became president. In late February, more than 1,700 members of the United Electrical Workers union decided to strike after the Wabtec company took control of their plant from GE and refused to honor the union’s prior contract. Thursday’s agreement will provide a 90-day window for the union and plant managers to negotiate a new collective bargaining agreement.