The current trend towards the increase of speeds in the railway traffic and the ever growing gain weight on the axles has brought about a series of special problems concerning the impact stress which occurs at collision. In order to isolate the shock that occurs longitudinally, the rail vehicles are fitted with shock dampers: - Buffers or main coupling dampers - Long-rung buffers fitted on the platform wagons, meant as an additional safety measure for the goods loaded on the storage platform. Long-rung buffers fitted on the platform wagons are reducing the level of the longitudinal acceleration.