The specificity of the undersea tunnel brings some new problems on the tunnel maintenance to us, but in usual maintenance and repair of tunnel, they will not be considered as specialized problems.

海底隧道的这些特殊性也给运营后的维修养护工作带来了新的问题，而这些问题在一般的隧道维修养护中通常不另作专门的考虑。

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Excellent tunnel lighting project, should have excellent lighting effects, convenient maintenance, steady power supply and reasonable control.

优秀的隧道照明工程，应具有优良的照明效果、便捷的维护、稳定的供电、合理的控制。

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Elastic monolithic track bed was used for East Qinling Super-long Tunnel for its good elasticity, less maintenance and low cost.

新建铁路东秦岭特长隧道采用弹性整体道床轨道基础，该基础弹性好，减少了线路维修工作量，降低费用。

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"You've really got one way through it that's the Salang Tunnel, " he said, referring to the treacherous, high-altitude truck route that passes through a long, decrepit tunnel that has seen little maintenance since Soviet engineers built it in the early 1960s.

WSJ: U.S. Sets Stage for Exodus from Afghanistan

Some of the larger rapid transit systems have a more interconnected web of tracks and tunnels, so if maintenance is happening in one tunnel, the trains can be rerouted in a different tunnel (for example, NY MTA).

FORBES: Why Does BART Need To Do Nightly Maintenance?

The Department of Transport said a sale will only be made to "a public body" able to take on the maintenance of the mile-long tunnel.

BBC: Harecastle tunnel offered for sale by the government