1. Research Associate, Institute of Railway Engineering and Transport Economy, Graz Univ. of Technology, Rechbauerstraße 12/II, Graz 8010, Austria (corresponding author). ORCID: .
2. Research and Teaching Associate, Institute of Railway Engineering and Transport Economy, Graz Univ. of Technology, Rechbauerstraße 12/II, Graz 8010, Austria.
3. Associate Professor, Institute of Railway Engineering and Transport Economy, Graz Univ. of Technology, Rechbauerstraße 12/II, Graz 8010, Austria.