Railways
Other power frequencies are still used. Germany, Austria, Switzerland, Sweden and Norway use traction power networks for railways, distributing single-phase AC at 16⅔ Hz or 16.7 Hz. A frequency of 25 Hz is used for the Austrian railway Mariazeller Bahn and for Amtrak's 25 Hz traction power system in the USA. Other AC railway systems are energized at the local commercial power frequency, 50 Hz or 60 Hz.
Traction power may be derived from commercial power supplies by frequency converters, or in some cases may be produced by dedicated traction powerstations. In the 19th Century, frequencies as low as 8 Hz were contemplated for operation of electric railways with commutator motors Some outlets in trains carry the correct voltage, but using the original train network frequency like 16⅔ Hz or 16.7 Hz.
Read more about this topic: Utility Frequency
Famous quotes containing the word railways:
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—H.G. (Herbert George)