simple relativity question

two people are on a train, they will set their clock, on opposite ends of the train, to 12:00 when a flash is seen emitted from a bulb at the centre of the train, equidistant from each person. An observer watches from a platform, and says that the two events of setting the clock were NOT simultaneous while another observer says that they were. Since each viewpoint is equally valid, when the the people step off the train, what will their clocks actually read? is there a discrepancy or not?

From the outside observer's point of view, the clocks will re-synchronize as the train slows to a stop.