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Yes everything is relative, and it's actually the fact that nothing can ever exceed the speed of light that allows time travel into the future. If you were able to travel close to the speed of light, say 90% in a magic train or spaceship then time "for you" slows down relative to the outside. The closer you get to the speed of light, the slower time "for you" becomes and the faster you are traveling into the future. If you were in a very long train that was traveling very very close to the speed of light, in theory if you were able to propel yourself through the train then your speed + the trains speed could exceed the speed of light, BUT of course that law of physics can't be broken so time would slow to compensate, if needed you would be completely frozen in time.
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