隧道养护
But due to the high proportion of bridge and tunnel, the poor transportation, a lot of traction transformers of AT power supply and missive civil engineering, it is more difficult to set up stations and operation maintenance for the electrified railway in mountain area.
但对于山区电气化铁路来说,由于其桥隧的比例高,交通不便,AT供电方式牵引变电所设施较多,土建工程较大,运行维护难度也较大。
This leads to the maintenance tunnel underneath the command bunker.
这个会带领我们到司令部下面的养护地道.
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