I have one small correction to make, which is my statement that Motor Daddy's numbers are correct for the times measured by the stationary system. They're not, at least not according to Relativity, because we also have to take length contraction into account. The stationary observer clocks the same time for the pulse to reach Z as Motor Daddy claimed, but at X the arrival time clocked by the stationary observer is equal to 1.19938s. In the train frame, the arrival times at X and Z are still both clocked at 0.5 seconds. I just want to get this narrowed down so in future he won't have any grounds for argument, complaint or discussion until he can explain Michelson's anomalous results. Once we get to that point (we're pretty much there now) I won't be wasting my time any further, and in future I can refer to this conversation so other people don't have to waste their time either.