As a result of the BLS's electrical test operation on the Spiez-Frutigen line, the Rhaetian Railway became interested in the new traction technology using single-phase alternating current. The Rhaetian Railway thus decided to use the Bever-Scuol line, which was still under construction, as a test track for single-phase alternating current. The Rhaetian Railway commissioned its energy supply from the Brusio power station. The Brusio power station had to ensure the supply of electricity from the Val Poschiavo via the Bernina Pass to a substation in Bever, which was specially erected for the transformation of the power to the required voltage of 11 kV/16 2/3 Hz. Thus, the Rhaetian Railway was able to operate the Lower Engadine line electrically from its opening.