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隧道是修建在地下或水下并铺设铁路供机车动车辆通行的建筑物。根据其所在位置可分为山岭隧道、水下隧道和城市隧道三大类。为缩短距离和避免大坡道而从山岭或丘陵下穿越的称为山岭隧道;为穿越河流或海峡而从河下或海底通过的称为水下隧道;为适应铁路通过大城市的需要而在城市地下穿越的称为城市隧道。这三类隧道中修建最多的是山岭隧道。
Tunnels are built underground or under water and paved the railway for motor vehicles and vehicles passing the building. According to their location can be divided into three types of mountain tunnels, underwater tunnels and urban tunnels. Known as a mountain tunnel under the hills or hills to shorten the distance and avoid large ramps; called underwater tunnels to cross the river or the Strait from under the river or the sea floor; in order to meet the needs of the railway through the big cities in the city The underground tunnel is called the city. Among the three types of tunnels built are mountain tunnels.