A few notes on the design, construction and maintenance of railway electrical signalling apparatus

Although several books and many papers have been written on the subject of railway electrical signalling, it is thought that the following notes may be of interest, as they are intended to bring up points not usually mentioned. With regard to the remarks on track circuits, the author has recently heard of a new type of impedance bond track circuit employing condensers at each of the track. It would be interesting to obtain a description and criticism of this type of track circuit.