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Why Sand is the Secret Sauce for These Ecuadorian Trains

Smithsonian Channel Pick of the Week

English - July 15, 2019 16:00 - 58 seconds - ★★★★ - 31 ratings
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Tren Crucero trains rely on sand to go up and down steep inclines: on the way up, sand helps provide the wheels with traction on the steel tracks, while during a descent, it aids the electric braking system.