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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Henryton Tunnel ： ウィキペディア英語版 Henryton Tunnel The Henryton Tunnel, located near Henryton in southern Carroll County, Maryland, is the third-oldest tunnel in the world that remains in active railroad use.〔Steve Okonski's (B&O RR Photo Tours from Woodstock to Henryton )〕 Constructed by the Baltimore and Ohio (B&O) Railroad and opened around 1850, it was the first tunnel constructed on the B&O's Old Main Line. In 1865 the tunnel was widened to accommodate double track. It was rebuilt into its current form in 1903. The tunnel has brick portals and lining. The coping and footings are concrete. == See also == * Baltimore and Ohio Railroad * Industrial Archaeology 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「Henryton Tunnel」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.