Railway track superstructure (RTS) elements; RTS static and dynamic calculation; rail temperature-induced stresses; RTS longitudinal forces; Continuously welded track (CWT) stability against buckling; RTS special structures; expansion devices; switches & crossings (S&C) Condition-based decision-making basic concepts and its link with railway track diagnostics and maintenance; measuring and analysis of railway infrastructure elements (RIE) condition; basic concepts of track segmentation; RIE condition-parameters; RIE behavior basics; RIE deterioration-modeling; RIE maintenance management systems; RTS maintenance & renewal (M&R); manual and mechanized RTS routine maintenance; railway track substructure maintenance; railway track reconstruction notion, purposes and methodology; Exercise: curve elements calculation for a given traffic loading; calculation of guiding forces and accelerations during the passage of a vehicle through a curve; RTS forces calculation induced by vehicles; calculation of temperature-induced stresses in CWT and stability control under given temperature regime; calculation of CWT forces on bridges; calculation of expansion devices capacity. Maintenance: individual exercises; every student receives individually conceived tasks, thematically and chronologically compliant with the lectures.