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磁家坞——大安山是北京西郊拟建的一条矿山专用铁路线。该线全长34.5公里，四处悬崖绝壁，深谷急流，山势迂回转折，坡度陡峻，地形异常复杂，仅在后段约8公里的航空线距离内高差竟达300余公尺。线路穿过高达几十公尺的悬崖36处；八渡大石河；转折弯道57个；隧道30余座，占全线长25％；大中小桥涵约80余座，勘测工作十分艰巨，队员们称之为小“宝城”。
Magnetic Jiawu - Da’anshan is a mine-specific railway line proposed to be built in the western suburbs of Beijing. With a total length of 34.5 kilometers, the line is surrounded by cliffs, steep valleys, rapid turnarounds, steep slopes, and an extremely complex topography. It is only about 300 meters above the airline in the rear section. The line passes through 36 cliffs of up to tens of meters; there are 57 rivers and rivers; there are 57 turning curves; more than 30 tunnels occupy 25% of the total length; there are about 80 bridges and culverts of large, medium, and small bridges. The survey work is arduous. Call it a small “treasure city.”