This book gathers original research and developments in railway noise and vibration. Based on the 15th International Workshop on Railway Noise (IWRN15), held on September 15-19, 2025, in Isla de La Toja, Spain, it gathers peer-reviewed papers covering a broad range of topics related to railway noise and vibration, and their mitigation. They offer new insights into rolling noise, wheel squeal, high-speed rail and aerodynamic noise, ground-borne noise, and vibration, among other topics, and report on advances in noise prediction methods, measurements, and monitoring. They also cover research findings relating to rail roughness, rail corrugation, and grinding, as well as resilient track forms, and policy and regulation for railway noise and vibration. Offering extensive and timely information to both scientists and engineers, this book will help them in their daily efforts to identify, understand, and solve problems related to railway noise and vibration, and to achieve the goal of reducing the environmental impact of railway systems.