Modeling of Audiofrequency Track Circuits for validation, tuning and conducted interference prediction

The modeling of track circuit (TC) signaling systems is considered to be a valuable tool for their validation (check of operation for exceptional and extreme network conditions and configurations), compatibility assessment (with respect to sources of conducted interference), and pretuning (before on-site tuning). The model can replace a series of preliminary measurements and speed up the on-site tuning procedure. The results of model verification and validation on the Torino–Novara trunk of the Italian High Speed Railway Line are presented. The accuracy and reliability are quite good from an absolute viewpoint and are compared with the traditional on-site TC tuning; the time saving is of an order of magnitude.