This book contains the presentations given during the 9th International Workshop on Railway Noise (IWRN9) which took place in Munich/Feldafing, Germany, on 4th to 8th September 2007. This workshop was organised by the Acoustics and Vibration Department of DB Systemtechnik, the technical engineering office of Deutsche Bahn AG. More than 120 participants from 17 countries followed the invitation to the wo- shop. This great response showed the continuing interest in an important topic of railway technology and offered the opportunity to present the recent results of intense worldwide activities to the international community of railway noise and vibration experts and to share knowledge as well as experience. Because an efficient transportation network is indispensable to handle the general mobility increase and road networks have reached their socio-ecological limits, the railway network is to be strengthened. For example the European Commission has given distinct political signals to get more passengers onto the railways. This policy represents a clear challenge for the next few decades not only for European railway companies: the considerable increase in mobility will lead to a doubling of the railway traffic volume within the next 10 to 20 years. To reduce the environmental impact, the Directive on the Assessment and M- agement of Environmental Noise has been put into force in Europe, aiming at avo- ing, preventing or reducing harmful effects of environmental noise on human health.

Session 1: High Speed Trains (I).- Environmental Noise Reduction of Tokaido Shinkansen and Future Prospect.- Distortion of Compression Wave Propagating through Shinkansen Tunnel.- The Influence of the Train Speed on Vibrations Due to High Speed Trains.- High Speed Train Noise Effects on Wildlife and Domestic Livestock.- Wind Tunnel Tests on the Control of Aeroacoustic Noise from High Speed Train.- Session 2: High Speed Trains (II).- Measures to Counteract Micro-pressure Waves Radiating from Tunnel Exits of DB¿s New Nuremberg-Ingolstadt High-Speed Line.- Acoustic Assessment of Micro-pressure Waves Radiating from Tunnel Exits of DB High-Speed Lines.- High Speed Railway Noise: Assessment of Mitigation Measures.- Noise Measurement Results of Shinkansen High-Speed Test Train (FASTECH360S,Z).- Noise Sources for High Speed Trains: A Review of Results in the TGV Case.- Session 3: Ground Borne Vibrations (I).- Survey of Metro Excitation Frequencies and Coincidence of Different Modes.- Floating Slab Track above Ground for Turnouts in Tram Lines.- Vehicle/Track Impact Due to Passing the Transition between a Floating Slab and Ballasted Track.- Recent Developments in Operational Rail Noise and Vibration in NSW, Australia.- Experimental Validation of a Numerical Model for Subway Induced Vibrations.- A Numerical Model for Re-radiated Noise in Buildings from Underground Railways.- Session 4: Ground Borne Vibrations (II).- The Influence of the Soil on Track Dynamics and Ground-Borne Vibration.- A User-Friendly Prediction Tool for Railway Induced Ground Vibrations: Emission ¿ Transmission ¿ Immission.- Using the PiP Model for Fast Calculation of Vibration from a Railway Tunnel in a Multi-layered Half-Space.- Structure-Borne Noise and Vibration Control for Chatswood Interchange.- Measurements and Investigations at the Floating-Track-Bed System in the North-South Tunnel in Berlin.- Propagation of Vibrations Due to a Tramway Line.- Session 5: General Rolling Noise Aspects (I).- Railway Noise Statistics by Monitoring Stations ¿ Input for Dutch Prediction Method RMR and Track Access Charging.- Measurement and Modelling of Noise from the Arsta Bridge in Stockholm.- Minimising Noise from Viaducts in the Borough Area of London for the Thameslink Programme.- The New German Prediction Model for Railway Noise ¿Schall 03 2006¿ ¿ Potentials of the New Calculation Method for Noise Mitigation of Planned Rail Traffic.- Floating Slab Track Re-engineering: Experience Drawn from a Completely Renovated FST Damaged by Major Flooding in Sao Paulo Metro.- Session 6: General Rolling Noise Aspects (II).- In-Car Noise and Carriage Floor Vibration on Different Track Forms and Curvatures in a Metro System.- Experimental and Theoretical Analysis of Railway Bridge Noise Reduction Using Resilient Rail Fasteners in Burgdorf, Switzerland.- Comparison of Two Metrics for Assessing Human Response to Vibration.- A Study on Source Mechanism in the Interior Noise Problem of High Speed Trains.- Reducing the Noise Emission by Increasing the Damping of the Rail: Results of a Field Test.- Session 7: Cost Benefit Considerations of Noise Abatement.- Railway Noise Abatement: The Case for Retrofitting Freight Vehicles with Composite Brake Blocks.- A Systematic Approach for Arriving at Reasonable Heights and Locations for Noise Barriers Adjacent to Railway Lines.- How Can Infrastructure Manager Influence Noise Generation of Rolling Stock.- Acoustic Effectiveness of Damped Wheels and Impact on Life-Cycle Cost of Different Typologies of Passenger Trains.- Mitigation Measures for Open Lines against Vibration and Ground-Borne Noise: A Swiss Overview.- Session 8: Prediction Tools and Theoretical Models (I).- Preliminary Analysis on Effect of Sleeper Pitch on Rail Corrugation at a Curved Track.- A Hybrid Model for Noise Generation from a Railway Wheel Due to Wheel/Rail Impact.- A Time Domain Model for Wheel/Rail Interaction Aiming to Include Non-linear Contact Stiffness and Tangential Friction.- Optimization of Track Parameters, Considering Their Physical Dispersion, to Minimize Rail Corrugation.- Predicting the Effect of Temperature on the Performance of Elastomer-Based Rail Damping Devices.- Estimation of Sound Transmission through Extruded Panels Using a Coupled Waveguide Finite Element-Boundary Element Method.- Session 9: Prediction Tools and Theoretical Models (II).- Squeal Prediction for a Bogied Vehicle in a Curve.- Synthesis of Noise of Operating Vehicles: Development within SILENCE of a Tool with Listening Features.- IMAGINE Rail Noise Sources ¿ A Practical Methodology.- Optimization of a Wheel Damper for Freight Wagons Using FEM Simulation.- Session 10: Grinding, Corrugation and Roughness (I).- Types of Rail Roughness and the Selection of Vibration Isolation Measures.- Rail Roughness Monitoring in the Netherlands.- Rail Roughness Level Assessment Based on High-Frequency Wheel¿Rail Contact Force Measurements.- Session 11: Grinding, Corrugation and Roughness (II).- Testing the New Acoustic Rail Roughness Measurement Standard.- Practical Implementations and Benefits of Highly Accurate Rail Roughness Measurements.- Session 12: New Noise Reduction Technologies (I).- New Rail Dampers at the Railway Link Roosendaal-Vlissingen Tested within the Dutch Innovation Program.- Theoretical Study on Noise Reduction of Rail Component by Use of Rail Absorber.- Reducing Wheel-Rail Interaction Forces and Roughness Growth by Application of Rail Dampers.- Session 13: New Noise Reduction Technologies (II).- Mitigation of Wheel Squeal and Flanging Noise on the Australian Rail Network.- How to Avoid Squeal Noise on Railways State of the Art and Practical Experience.- Noise Reduction Measures at Freight Train Locomotives ¿Blue Tiger¿.- Noise Reduction at Urban Hot-Spots by Vehicle Noise Control.- Poster Session.- Directivity of Railway Rolling Noise.- Complex Eigenvalue Analysis of Railway Curve Squeal.- Wave Propagation in Railway Tracks at High Frequencies.- Stability and Transient Analysis in the Modelling of Railway Disc Brake Squeal.- Large-Scale Fatigue Test of Stone Wool Based Anti-vibration Mats.