Quality of train circulation; it is an important management objective and criterion as it represents a fundamental parameter of quality for customer service. Regularity means the punctuality of the trains and their ability to respect the established timetable. It is possible to define some main classes of causes that can determine a reduction or an alteration of the regularity of the service: accidental internal causes, configurable as failures to the rolling stock, to the line or station security systems, errors in the regulation of the traffic; internal permanent or systematic causes, such as plant inadequacies, means or inefficiencies of an organizational nature; external causes not attributable to internal malfunctions of the railway system (for example strikes, track occupations or serious natural disturbances)
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