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Have you ever wondered how trains manage to climb those super steep hills? You might think their weight and speed would be enough, but those same forces that help them on flat ground work against them uphill, causing their metal wheels to lose grip on smooth metal tracks. This gets even worse when it rains. And once the wheels start spinning on a hill, it's game over. To deal with this situation, the drivers rely on a tool called the sandbox, it fires a jet of dry sand directly in front of the wheels providing traction even on the steepest and wettest climbs.