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93,000 mps No. Subtracting the speed of the train from the speed of the light isn't what you want to do. And here's a hint: You don't want to add velocities, either. A ball can travel at many different speeds. How about light? Try again. Sagan on Time Travel | Traveling Through Time Timespeak | Think Like Einstein | Resources Teacher's Guide | Transcript | Site Map Editor's Picks | Previous Sites | Join Us/E-mail | TV/Web Schedule About NOVA | Teachers | Site Map | Shop | Jobs | Search | To print PBS Online | NOVA Online | WGBH © | Updated November 2000 |