The horizon is perfectly level. What you see is the grade
Shadows and brightnesses
The slow and difficult climb with a loaded train full of copper concentrate, on the sharp grade leading to the Potrerillos plant.
Traveling the Atacama Desert, at the foot of the formidable Andes Range, this train carries much needed sulfuric acid for the production of copper to the Mina Franke mine at Altamira.
A lonely relic on the Atacama desert floor
