Garry KeenorThe 1950s saw renewed interest in AC OLE, driven by the emergence of reliable control mechanisms and more compact rectifiers. This meant that long-distance high voltage AC transmission was now feasible, and with it intercity electrification. Experiments with 50Hz AC traction were made in Germany in 1940. The French picked these up after hostilities ended, and as the 1950s progressed the 1500V DC standard was dropped across Europe in favour of 15kV and 25kV at AC industrial frequency.
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