ABSTRACT: Noise and vibration are among the most important environmental issues to be addressed when designing high-speed railroad lines. While noise prognosis follows well established design procedures, vibration prognosis and mitigation is a much younger field which is still very much open to innovation. In Austria, a system of vibration prognosis has now been practiced and successfully applied for several years at a number of high-speed railway projects that relies on a combination of measurements, analytical approaches and numerical analysis. The prognosis system is currently being expanded to include probabilistic approaches.