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A base tunnel is a type of railway tunnel that is built through the base of a mountain pass. When originally constructed the "classical" lines through mountainous terrain tried to minimise tunelling, due to expense, often with the consequence of long and steep gradients and sharp curves. The base tunnels take the opposite approach, minimising gradients and curves with the consequence of having longer tunnels. Base tunnels include: * Gotthard Base Tunnel, Switzerland * Zimmerberg Base Tunnel, Switzerland * Brenner Base Tunnel, Austria and Italy * Furka Base Tunnel, Switzerland * Ceneri Base Tunnel, Switzerland * Lötschberg Base Tunnel, Switzerland * Apennine Base Tunnel, Italy * Mont d'Ambin Base Tunnel, France and Italy * Pajares Base Tunnel, Spain 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Base tunnel」の詳細全文を読む スポンサード リンク
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