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## Main Question or Discussion Point

I am an amateur and I have a question about time and relativity. It is my understanding that Einstein theorized that time slows down for a moving object based on his thought experiment of an individual shining a light in the forward direction on a moving train. Since the speed of light is constant for the person on the train as it is for the person on the bank outside the moving train, time would slow down for the person on the train observing the light moving forward.

Here is my question: With everything else being equal, does this mean that if the person on the train was shining the light to the back of the train, that time would speed up for the observer on the train (so that the speed of light remained constant)?

Here is my question: With everything else being equal, does this mean that if the person on the train was shining the light to the back of the train, that time would speed up for the observer on the train (so that the speed of light remained constant)?