Practicing Lorentz transformations but still not absolutely clear about conditions for observer's frame of reference. For example: Suppose that just as one of Einstein's long and surreally fast trains is passing a station platform, lightning strikes the platform at two points making scorch marks just short of each end of the train and on the platform. The strikes are judged simultaneous by an an observer on the platform who is equidistant from both strikes. The train then reverses slowly back to the platform. Can it be stopped so that the scorch marks are precisely aligned in spite of their being made while the train was moving at high speed relative to the platform and subject to length contraction?