Developing a proper monitoring methodology is essential to guarantee safety and ride comfort. Typically, studies aimed at improving monitoring and maintenance plans focus on addressing vertical irregularities in the D1 wavelength range (3 – 25 m), crucial for passenger vehicle safety. However, periodic track irregularities at longer wavelengths, known as Cyclic Top (CT), can affect freight wagons and potentially lead to derailments, as documented in various derailment reports. In this project, track irregularity measurements are analysed to develop a methodology able to identify CT and detect it at an early stage.
