Burgdorf–Thun railway
…World War and, on the contrary, revenue from both passenger and freight traffic tripled from 1914 to 1920. As early as 1919, the electrification of the Bern–Thun railway caused complications in Thun. In 1920, Bernischen Kraftwerke announced an occasional increase in frequency from 40 to 50 hertz. The three-phase vehicles…