With a length of over 35 miles, the world's longest train tunnel should become operational at the end of 2017.

这个隧道全长35英里，是世界上最长的火车山体隧道，预计将在2017年年底通车。

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Should the project get the nod from the politicos, work will begin on joining the southwestern Japanese city of Karatsu with the south Korean port of Busan with a 79-mile (128-km) train tunnel.

如果该项目得到双方政客的点头，这条79英里(128公里)的火车隧道将同时从日本西南部城市唐津和韩国南部港口釜山同时动工。

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The sudden plunging of a train into the darkness of a tunnel, and the equally sudden rush into full daylight, would cause great damage to eyesight.

火车突然冲进黑暗的隧道或突然冲出光明，都会对视力造成极大的损害。

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While any train tunnel project has yet to be solidified, the officials said Superstorm Sandy showed the need to add to the region's transportation infrastructure.

WSJ: US funds to preserve space for NY-NJ train tunnels

For the chance at one day riding in a new train tunnel beneath the Hudson River, commuter rail riders may have a strange entity to thank: superstorm Sandy.

WSJ: Option Preserved for Another Tunnel Under Hudson River

The MTA took extensive measures before the storm to limit the amount of water flooding into tunnels, including by boarding up ventilation grates in low-lying stations, piling sandbags at station entrances, inflating a rubber dam in the Long Island Rail Road's West Side yards in Manhattan and hastily erecting a floodwall across the mouth of the No. 3 train tunnel near East 148th Street in Harlem.

WSJ: Salt Water Puts City's Subway System 'in Jeopardy'