This paper describes an effort to calculate marginal costs for railway traffic in Sweden using 1) standardised and already well established methods for calculating noise and 2) valuations of noise based on hedonic regression. The main point is that the marginal costs are calculated using well established methods used for other purposes (urban planning for the noise method and cost benefit analysis for the noise values), the combination of these methods requires knowledge in both transport economics and acoustics but apart from that no new methods need to be developed. The results show large variations over the network explained mainly by the large variations in population density. It is necessary to include similar variations in a charging system in order to gain the full benefits of internalizing the noise cost.