Joseph Kaczmarek / AP
Members of the Brotherhood of Locomotive Engineers and Trainmen (BLET) union and members of the International Brotherhood of Electrical Workers (IBEW) wave to motorist while walking a picket line outside the Roberts Avenue rail yard in Philadelphia on Saturday, June 14, 2014, after the two unions went on strike at midnight Friday. Pennsylvania Gov. Tom Corbett asked President Barack Obama on Saturday to intervene the dispute between the Southeast Pennsylvania Transportation Authority and its engineers and electricians unions. He did, and workers were expected to return to their jobs.