a red train passing on the rhaetian railway track with the famous tight 180° curve

180 aerial alp alpine alps background berina bernina curve curvy drone engadina europe famous glacier grisons gruem grum high image landscape line mountain palu pano panorama panoramic pass passing piz poschiavo railroad railway red rhaetian scenery sharp snow suisse summit swiss switzerland tight top tourism tourist track train transport transportation travel turn unesco valley view winter