Data indicating the level of noise according to the strategic noise mapping of major rail sources within areas with a population of at least 250,000 people (agglomerations) and along Network Rail routes with more than 60,000 train passages per year. Lden indicates a 24 hour annual average noise level with separate weightings for the evening and night periods. This data is a product of the strategic noise mapping analysis undertaken to meet the requirements of the Environmental Noise Directive (Directive 2002/49/EC).
