In My Day caller Rex shared his experience on the Mauritania Iron Ore Train.
The train runs 704 km through the Sahara from Zouerat to Nouadhibou.
It is one of the world's longest and heaviest trains, spanning up to 3 km (1.9 mi) with over 200 carriages, and tourists and locals often ride on top of the open-air carriages for free.
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