Hi, I feel really out of my depth and this is just to satisfy a personal frustration. I can see that the light from both flashes should reach a passenger on board the train at the same time and also that it should hit from the front first, but I just can't seem to make it work in my head. Are there equations I could try and work through to show what point the light has physically reached at each point in actual time? Each line of reasoning makes sense but I am still struggling to figure it out as a whole. Sorry if it's too simplistic.