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Swiss Railway Viaduct, Switzerland, 1998
The route from Pontresina to Tirano is steeply graded, but less so than it could have been. Because it is a rail line, frequented by mostly conventional trains using bare steel wheels on bare steel rails, there are still limits as to what the trains can take. Therefore, there are a number of rail spirals, like this one, and switchbacks as well. That building we're heading into is a snowshed.