Investigating solutions for an intrusive curving noise
The London Overground is a suburban rail network serving London and most of its boroughs. It was established in 2007 and features 113 stations on nine different routes.
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The Challenge
Transport for London (TfL) London Overground required a team to undertake an investigation into the options to mitigate a ‘curving noise’ arising from Class 378 Electrostar trainsets passing through a tight radius railway curve in the London Borough of Hackney. The curving noise was highly tonal and intrusive in character. RWDI was commissioned for the project.
Our Approach
RWDI’s team of noise and vibration experts:
- Conducted a study that included a comprehensive literature review, processing, and examination of measured noise levels from a noise monitor located in the vicinity.
- Investigated potential mitigation options, both physical and operational, which might benefit the nearby sensitive residential properties where complaints had been received.
The Outcome
RWDI’s investigatory work subsequently focused on the development of a noise model and the prediction of the potential levels of sound reduction at the floors of the surrounding sensitive receptors that might be afforded by the installation of different configurations of lineside noise barriers. Proposals for further work were also put forward, which included a review of the current wheel re-profiling regime, further calibration of the top of rail friction modifier and rail gauge lubrication systems, and recommended approaches to a continuous noise monitoring system.