Electric locomotive Be 5/7 no 151 Berne-Lotschberg-Simplon Railway BLS 1913 Following successful tests on the access line to Frutigen, BLS ordered the first series of locomotives for the new single-phase alternate current system that had been developed and thoroughly tested by Oerlikon Engineering Works MFO. At that time, the machines designed by MFO were the most powerful electric locomotives in Europe. The transmission of the huge power of the motors to the power axles over intermediate gears and rods was quite problematic. Shaking vibrations caused the rods to break. One had to wait for 1940 to get an improved drive that proved well. MFO SLM 107 t 75 km/h 1840 kW restoration by BLS