train bridge over a road between the mountains in salta, argentina. tren de las nubes (cloud´s train)

transport track mountain railway highway road valley hill infrastructure bridge train landscape vehicle freeway lane over between mountains salta argentina tren nubes cloud´s construction from line called iconic because height tracks today only used for tourism train bridge clouds construction height salta argentina tourism puna northern high vertigo altitude railway railroad rail travel track transportation tracks steel landscape sky green road nature line transport rails way perspective tree mountains industry journey trees old