Background: This 33.5-mile-long rail tunnel links the island of Honshu with the island of Hokkaido.

背景材料：这条33.5英里长的铁路隧道连接北海道与本州岛。

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By the time it opens in 2016, the 35.4 mile Gotthard tunnel will be the world's longest rail tunnel.

等到2016年全线通车的时候，全长35.4英里的圣哥达隧道将会是世界上最长的铁路隧道。

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In the next few years a rail tunnel will open under the Bosporus, 150 years after it was first mooted.

未来几年里，在博斯普鲁斯海峡问题第一次被讨论的150年后，一条海底隧道将会交付使用。

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New Jersey Gov. Chris Christie spiked the rail tunnel three weeks ago due to concerns about cost overruns.

WSJ: City Could Extend No. 7 to New Jersey

Eurotunnel already operates the Channel rail tunnel, and runs the Le Shuttle services.

BBC: Eurotunnel purchase of Sea France ferries faces inquiry

Sections of a drill which broke through the roof of a rail tunnel came from a construction site above the ground, accident investigators have found.

BBC: Construction drill came from site above rail tunnel