Track circuits wiUi a 50 Hz carrier frequency are used on many DC-operated metro railways . In principle ... One half of each of the two S bonds which define the track section is tuned to the carrier frequency of its track circuit. At the S-bond, anbsp;...
|Title||:||International Conference on Main Line Railway Electrification|
|Author||:||Institution of Electrical Engineers, Institution of Civil Engineers (Great Britain), Institution of Mechanical Engineers (Great Britain), Institution of Railway Signal Engineers (Great Britain)|