Dali–Ruili railway
The line traverses rugged terrain , and bridges and tunnels will account for 75% of the total track length , including the 34 . 5 km Gaoligongshan Tunnel through the Gaoligong Mountains . 
<triplet> Gaoligongshan Tunnel <subj> 34.5 <obj> length <subj> Gaoligong Mountains <obj> crosses