Abstract
Knowledge of the gauge limits on operating railway lines is essential for safe railway traffic, as defined by the train time-table. The article presents, from a historical perspective, the development of diagnostic measurements. The first designs of measuring vehicles, which systematically reduced the time for diagnosing railway lines, including tunnels, are also presented here. The engineering and technology progress allowed the development of new surveying methods, successively implemented by upgrading diagnostic vehicles. Such measures simultaneously affected the quality of measurements, allowed measurements to be taken at increasing speeds, as well as to automatically create a gauge limit database on the DB AG network. This data is used, inter alia, for the codification of railway lines for the purposes of intermodal transport and special shipments. Keywords: rail transport, DB AG railways, structure gauge, measuring wagons
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