During 1903, Albula Tunnel was opened to traffic. Early working of the tunnel was by steam locomotives, however both it and the entire route were later electrified using the standardised 15 kV, 16⅔Hz system. Various passenger services use the tunnel on a routine basis, such as the luxurious Glacier Express. According to industry publication Rail Engineer, the danger posed by rock falls became ever-present towards the latter half of the twentieth century.
