PM emissions from railways – Results of tests on a wheel-rail test bench

• Published in: Transportation research. Part D, Transport and environment Transport and environment, 2023-09, Vol.122, p.103858, Article 103858
• Main Authors: Fruhwirt, Daniel, Sturm, Peter, Nöst, Thomas, Leonhardt, Philip, Bode, Gina, Michael, Sabrina, Rodler, Johannes
• Format: Article
• Language: English
• ISSN: 1361-9209; 1879-2340
• DOI: 10.1016/j.trd.2023.103858

The sources of non-exhaust emissions from railways have been identified in the past. However, the quantification of the emission from railways is subject to a large degree of uncertainties, as published emission factors vary by orders of magnitude. The presented study aims a detailed quantification of the wheel-rail contact. For this reason, a series of tests at a wheel-rail test bench was conducted. The emission monitoring covered particle mass, particle size distribution and filter sampling in order to enable a chemical analysis of the particle composition. According to the test results the cumulative PM10 emissions of the wheel-rail contact (entire train) range from 0.33 to 5.57 g/km. The average proportions of PM2.5 and PM1 in the PM10 emissions were 87.5% and 68.46% respectively. While in straight-line driving and in wide curves the number of axles is the most dominant parameter, in tight curves, the bogie length becomes more relevant.