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Rail responses predicted by the non-linear and linear models of unit length of the reference ERS subjected to a load simulating a train passage (ETR 500 coach at 72 km/h) and a dynamic force caused by a rail roughness with a wavelength of 120 mm (170 Hz) with an amplitude of 20 N: (a) time window of 1.2 ÷ 1.8 s (centred at the instant of the passage of a bogie); (b) time window of 1.7 ÷ 1.8 s (for a better visualisation of the high-frequency vibration).
