Railway transport increases the noise levels in the environment 24 hours a day. As a rule, this leads to disruption of citizens' dormancy during the daytime and especially at night. The most widely used means of reducing railway noise are sound road barriers and soundproof structures of buildings located in the first echelon and facing the railway tracks. The airborne sound insulation of such protective systems is of primary importance. According to the International Standard ISO 717-1:2013 requirements and performance of airborne sound insulation of buildings are given with the help of single-number parameters and evaluated as the sum of a weighted apparent sound reduction index and the corresponding member of the spectral adaptation. The International Standard was partially introduced in Russia as the National Standard GOST R 56769-2015. In the paper the comparison is made of the A-weighted normalized noise spectra for various categories of the railway transport operated on Russian railways with the noise spectra used in the International and Russian Standards to calculate the members of the spectral adaptation. By the specific example the divergences in obtained values of spectral adaptation terms are shown and corresponding recommendations are offered.

railway transport, noise, sound insulation, spectral adaptation term