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The Ceneri Base Tunnel (CBT) is a railway tunnel under construction in Switzerland's Canton Ticino. It will pass under Monte Ceneri between Camorino in the Magadino Flat and Vezia near Lugano, and will bypass the current high-level rail route through the Monte Ceneri Tunnel. It has a total length of 39.8 km (24.7 miles).〔http://www.alptransit.ch/en/status-of-the-work/raw-construction/ceneri-base-tunnel.html〕 It is another part of the Swiss AlpTransit initiative NRLA. On completion, the CBT will be an important feeder in the south for the Gotthard Base Tunnel as the existing, proportionally steep track over Monte Ceneri isn't suitable for high-speed rail or heavy freight trains. Another feeder is the Luino link along Lake Maggiore which is about to be upgraded by Italy in prospect of the opening of the Gotthard Base Tunnel. Both links meet in the Magadino Flat in the future Camorino Node ((イタリア語:Nodo di Camorino)). The CBT and Gotthard Base Tunnels are being built under contract from the Swiss Federal Government by ''Alptransit Gotthard AG''. Construction of the two single-track bores with a planned length of started in March 2006. The official start was celebrated on 2 June 2006 with the laying of a foundation stone. An exploration tunnel near Sigirino was excavated between 1999 and 2003 to gain geological data on the rock formations at the CBT's level. From the data gathered, it was decided that only a small part can be drilled using a tunnel boring machine; the rest will be excavated with traditional blasting methods. The CBT will ease local train traffic, mainly between the two major cities Locarno and Lugano but also between Bellinzona and Lugano. Travel time on the S-Bahn from Locarno to Lugano should drop from 50 to 22 minutes. == Progress == In June 2009, the Board of Directors of AlpTransit Gotthard Ltd announced the construction contract for the tunnel had been awarded to the Consorzio Condotte Cossi consortium, at a value of 987 million Swiss francs. Boring work on the tunnels started in spring 2010. Excavation should be complete by early 2016. Once excavation is complete, railway infrastructure will start to be installed. Commercial usage of the Ceneri Base Tunnel through revenue train services is expected to start in late 2020. In March 2010, it was announced that blasting had begun on the main drives of the CBT. Tunneling reached full-speed by the end of 2010. Breakthrough in the west tube between Sigirino and Vezia occurred on 17 March 2015 at 12pm local time. 〔http://www.alptransit.ch/en/media/press-releases/ceneri-basistunnel-durchschlag-der-westroehre-zwischen-sigirino-und-vezia-1053.html?cHash=d78a20e8c4b75dc556c669a102cdbcaf〕 Breakthrough in the east tube between Sigirino and Vezia occurred on 30 March 2015 at 5pm local time. Monthly progress update graphic: http://www.alptransit.ch/fileadmin/dateien/stand-arbeiten/ceneri-basistunnel/cbt-e.gif 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「Ceneri Base Tunnel」の詳細全文を読む スポンサード リンク
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