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[–] 15 points 2 years ago*

It doesn't double the capacity. It's more a 30% increase. And, double-deckers are actually old. They date from the 19th century. In 1855, the Chemin de fer de l'Ouest introduced double-deckers on suburban lines of Paris.

https://fr.wikipedia.org/wiki/Voiture_Ouest_%C3%A0_imp%C3%A9riale

Modern double-deckers date from the 1930s, with the Voiture à étage Etat:

https://fr.wikipedia.org/wiki/Voiture_%C3%A0_%C3%A9tage_%C3%89tat

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