recently i read about the embankement-train thought experiement, however i find it diffcult to understand supposer the right end of the platform is A and left B, a train of same length as platform travels from B to A direction. In the reference frame of the platfrom, a observer in the middle M sees two light arrive simultaneously from A and B, so he measeure his distance from A and B and conculde he is in the middle, therefore the lightning is simultaneous. Also from his frame(platform), and the two light pulse travels at same speed toward observer 2 on the mid point of hte train M' as the trains front and back are aligned with the platform. Since he sees obervers 2 moving towards A, he will conclude that observer 2 will not see the events as simultaneous. However the problem is, since the notion of simultaneous does no take into account the time taken to travel from the event to the observation point(ie that time lights' travel is subtracted from time seen). in the statement Since he sees obervers 2 moving towards A, he will conclude that observer 2 will not see the events as simultaneous. the first oberver has not taken into account that oberver 2 has to subtract the time taken for light to travel to him(observer 2) What actually does the observer 2 see on the train? When light reach him from point A and B, the train is not aligned with the platform, so when he subtracts the time it taken light to travel from A to him and B to him, what does he observe, and what is the space time coordinate (x,y,z,t) for the two events????