The railway opened here with some sections on a 4-5% grade, but lives were lost and through-put was low. In 1927 the grade was lessened by tunneling into the mountains and spiraling around, coming out at a different level. This is complicated to visualize on site, and not just for these foreign language tourists arguing over the model.
The top photo shows a single long train. It is passing from left to right behind the trees in the foreground (cars not visible to the camera), circling to the left and entering the higher tunnel; at the same time cars are visible from the same train emerging from the mountain at a lower tunnel and moving toward the lower left corner of the photo.
There is a second spiral tunnel on the other side of the highway.
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