The use of elastomeric particles obtained from old tires to produce anti-vibration mats to reduce vibrations in railways is studied. In the first part of this work a numerical simulation for dimensioning the element has been performed. The behavior for a wavy surface was deducted obtaining good approximation to the empirical results. In the second part the methodology used to assess the Insertion Loss, IL, provided by the anti-vibration system is described. The analytical superstructure/ground model developed within the frame of the project is presented. The model is based on an elementary superstructure model with no elastomeric material and is conveniently modified to introduce an under ballast mat. Finally the study shows the validation of the mechanical behavior of prototype mats under dynamic efforts according to standards [1-6]. The results show that the behavior of crushed rubber is suitable to be used as anti-vibration systems