The biggest complication faced by the construction of the Trans-Andean railroad was the Devil’s Nose, a mountain with almost perpendicular walls. To overcome this obstacle a zigzag railroad was bulit that climbs more than 500 meters in less than 12,5 km with steep ascents and descents. It today remains an impressive piece of engineering.
Best summary I found:
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Yeah, that does sound a little rough, haha.