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After his studies of mechanical engineering and the doctorate in the field of transport systems, Dr. Stephan Liedl joined TUV SUD. Based on the long-term relationship with local authorities and public transport companies, he developed the BOStrab Inspection Body to an internationally operating department Metro / Light Rail Systems. He has more than 20 years of experience in the field of public transport and has completed many metro and light rail projects in Germany, Europe and overseas as independent safety assessor or project manager.
Dr. Liedl is an expert for rolling stock, risk assessment and system integration. He is member of German standardization committee for body side entrance systems for rolling stock. In TUV SUD Rail he is currently entrusted with the tasks as lead assessor as well as business development in the field of metro and light rail.


  • June 10: Delivering large projects: from planning to rolling stock renewal

    When to modernise as an alternative to procure new rolling stock?

    Keeping existing rolling stock in operation can be a valuable alternative to procuring new rolling stock, even when facing higher performance requirements and raising comfort expectations. Finding smart & cost-effective solutions for maintaining or enhancing operational capacity and meeting customer quality demands, is a challenge. Budget constraints, local conditions, long delivery times & high costs for new urban rail vehicles makes it interesting to evaluate the option of modernisation & refurbishment. A key task for decision makers is to make the right choice on whether to procure new rolling stock or to modernise existing fleets. Modernisation can be a cost-efficient solution to exploit the initial vehicle investment over the full life time; to offer up-to-date transport service. Lower cost & reduced projects risks for modernisation could also outweigh the benefits from new vehicle procurement.