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Objectives: To estimate the impact of the critical speed over the power collecting system for the electric trains. Methods/ Analysis: Two models regarding the critical speed estimation related to the resonance phenomenon in the pantographcatenarysystemarestudied:firstly,bythedifferentialequationofthecontactpointtrajectory,andsecondlybythemaximum kineticenergyandthemaximumpotentialenergyoveraspan.Simulationsforthepantograph-catenary interactionattraindoi:10.17485/ijst/2016/v9i40/86736 fatcat:o3n4pp4ugvaaljeveyw3wwkgdu