Track circuits with a 50 Hz carrier frequency are used on many DC-operated metro railways . ln principle, fail-safety is ... One half of each of the two S-bonds which define the track section is tuned to the carrier frequency of its track circuit.
|Title||:||Second International Conference on Holographic Systems, Components, and Applications, 11-13 September 1989|
|Author||:||Institution of Electrical Engineers. Electronics Division|
|Publisher||:||Institution of Electrical Engineers - 1989-11-01|