Cobra mate,
oberver B will see the lightning at the back off the train first because the train( Observer A) is moving with relative velocity to his position. Becuase of this relative velocity the distance the light from the back of the train travels to reach him is LESS than the distance the...
hows about getting a piglet, covering it in grease, throw it in a hallway and then lock the doors at either end so its stuck in there, do it before lunch when people are still in their rooms and when they try to catch it..... dear god