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In page Transport in Western Sahara:

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Western Sahara has no rail service,[1] with the exception of a 5-kilometre (3.1 mi) section of the Mauritania Railway; which (since the closure of the Choum Tunnel), cuts across the extreme south-eastern corner of the territory. The rail-route is considered the world's longest cargo train covering a distance of 437 mi (703 km).[citation needed] Passengers with tickets ride in cramped cars while many illegal passengers, sometimes with livestock, ride on top of freight cars.[2]