I'm spelling it out for you because I can't seem to make myself understood. You quoted me in post 73: "If two light flashes started at the same time, ..." I mentioned synchronized clocks to be absolutely sure that you understand what "at the same time" means. If you think that's changing the scenario, then I don't know what you're thinking. You can put it that way if you like. I'd rather stick with light flashes emitted at the same time, like we established, but whatever floats your boat. The time for light from the front, and the time for light from the back. Do they measure the same times, or different times? If different, which time is shorter? What does this tell the train observer (if anything) about their absolute motion? Sorry, I don't know what you mean.