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93,000 mps No, although this is the common sense answer. You would think that, because you're moving in the same direction as the light, you should subtract your speed (the speed of the train) from the speed of the light to determine the light's speed relative to you. But that's not how light behaves. At what speed does light always travel? 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 |