{'fraction_non_alphanumeric': 0.019642857142857142, 'fraction_numerical': 0.0, 'mean_word_length': 5.333333333333333, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
The Model of Conductive Interference in Rapid Transit Signaling Systems

With the objective of gaining a complete understanding of conductive interference (CI) in rapid-transit signaling systems, many aspects of the problem have been investigated. This effort has formed part of the Department of Transportation's Urban Mass Transit Administration (UMTA) rail transit EMI/EMC program and has been conducted in coordination with the UMTA-sponsored Rail Transit EMI Technical Working Group. Topics studied have included dc current-dependent ac impedance of third rail and running rail; circuit properties of the running-rail third-rail circuit from train to substation; statistical signal properties and circuit properties of the multicar train as a source of audio-frequency chopper interference; the coupling of CI currents from rails to track circuit receivers; and field measurements of multicar CI. The result of this program is a complete model of CI that relates CI characteristics of single isolated cars to those of an actual system with multicar trains. Implications of the model for system design are discussed.