{'fraction_non_alphanumeric': 0.030523255813953487, 'fraction_numerical': 0.0436046511627907, 'mean_word_length': 5.097345132743363, '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 SAFETY TECHNOLOGY OF RAILWAY SIGNALLING : ITS MOST DISTINCTIVE FEATURES AND ITS WIDER APPLICATION

Since microelectronics was introduced to railway signalling, which requires a high level of safety, almost thirty years have passed. Safety is realised by diagnostic functions and safety-fixed outputs on the basis of fail-safe concepts, which have been developed through more than one hundred years of experience in railway operations. In the context of the risk-based safety management approach, nowadays safety requirements for railway signalling systems are prescribed in CENELEC standards (e.g. EN 50126, 50128 and 50129) as well as IEC standards (e.g. IEC 62278, 62279 and 62425).