Rail noise is an issue for conventional rail networks as well as for new generation high-speed lines, such as the proposed HS2 line between London, the Midlands and then, potentially, the North. It is taken seriously by governments, network operators, rail vehicle manufacturers and ancillary service providers and the issue is not just one for new and controversial rail schemes. Passby noise can be transmitted by either airborne or ground-borne routes. Airborne noise can be mitigated by noise barriers or earth bunds; improved rolling stock; rail dampers; noise insulation; and a high performance maintenance regime (including rail grinding). Groundborne noise can be mitigated through measures such as resilient and floating track forms. Other sources of noise such as ventilation systems benefit from insulation at source. The government is currently reviewing consultation responses to its plans for a new generation of high speed trains. The HS2 consultation document points out that around 4,700 properties could potentially experience a "noticeable increase in noise levels" (defined as a possible increase in rail noise of at least 3dB). With experience of HS1, Eurotunnel operations and other high speed railways abroad, experts insist key lessons have been learned in terms of mitigation of noise and vibration.
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