This line begins at St.Moritz and runs towards Pontresina (1,774 m) in Val Bernina. It ascends progressively through the valley to the Bernina Pass over the Morteratsch station (1,896 m) (with the Morteratsch Glacier and Piz Bernina, the highest summit of the Eastern Alps, in sight). After Morteratsch, the line runs towards Bernina Diavolezza (2,093 m), where an aerial tramway leads to Diavolezza, and Ospizio Bernina station. This station, next to Lago Bianco, stands at the line's summit at 2,253 m above sea and holds the title of the highest point of the entire Rhetian Railway network and among all adhesion railways in Europe.