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The official channel of the France 3 show. C'est pas sorcier, the magazine of discovery and science. Every day, no fewer than 300 long-distance trains leave the Gare de Lyon to transport some 250,000 passengers... Fred and Jamy have gone to explore the French railway network. They explain to us how the clever ballet of trains that travel the 30,000 kilometers of tracks that crisscross our territory is orchestrated down to the minute.