This paper analyzes the secondary suspension damping influence of a passenger rail vehiclernupon the ride comfort, evaluated via the sterling ride comfort index. The selection of dampingrnratio is a sensitive issue when a too small damping may compromise the vehicle dynamicrnperformance, and a too high damping leads to an increase in the system dynamic rigidity and,rntherefore, to an intensification of the vibration behavior.rnThe complete model of a vehicle with two suspension levels and a flexible car body has beenrntaken into consideration. Upon applying the modal analysis, a new form has been provided forrnthe movement equations that describe the symmetrical and anti-symmetrical movements of thernvehicle and their modes of excitation. This work is focusing on optimization of suspensionrndamping coefficient to improve the ride comfort of passenger rail vehicles. In doing rail vehiclernbody movement equations carried out and performed by MAT-LAB.rnAn increase in the damping of the secondary suspension may trigger a decrease of the comfort,rnin dependence with the position along the car body and the velocity. At car body Centre, it willrnlead to lowering the resonance amplitude for low velocities, whereas the vibration intensifies atrnhigher velocities, thus increasing the Wz index. Above bogie, the increase of Î¶c has a favorablernimpact upon comfort, irrespective of speed. At 50 km/h and the same damping ratio Î¶c = 0.3,rnthere is a lower comfort index Wz by 4%, at car body center and above bogie by about 2 %. Thernsecondary suspension damping greatly influences the ride comfort. This is the reason why thernissue of selecting this damping requires a solution of compromise. The primary suspensionrndamping enhances the comfort, but its increase is limited by the wheel/rail dynamic overloads.