Tunnel de Castin
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fronton coté Auch sa fiche sur:http://www.tunnels-ferroviaires.org/index.htm http://www.tunnels-ferroviaires.org/tu32/32091.1.pdf la ligne, depuis 5/6 km, depuis la vallée du Gers et Auch, vient ici franchir un col en tunnel et a gagné environ 90m d'altitude; les pauvres locos de l'époque devaient en avoir plein les bielles
Date de cette photo: 13 juillet 2011
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