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This short film from National Geographic was fascinating. The video profiles the Mauritania Railway. The railway is more than 430 miles long, and it has been transporting iron ore across the blistering heat of the Sahara Desert since 1963. The trains can be long as 3 kilometers long and are often the heaviest trains in the world. Along with iron ore, people also travel on the railway, in the hopper cars, to transport things like food and goods. Enjoy below!