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ÖZ INVESTIGATION OF THE EFFECTS OF THE QUALITY OF REPAIR AND MAINTENANCE ACTIVITIES IN RAILWAYS TO THE TRACK GEOMETRY: CASE STUDY OF KÜTAHYA-AFYONKARAHĠSAR RAILWAY LINE ABSTRACTAlthough railway is the safest transportation mode statistically nevertheless incidents may occur frequently. For this reason, maintaining the quality of the track within the standards is very important by the repair and maintenance activities to be performed. In this study, a specific part of the railway line having a fatal incident in 2008 between Kütahya and Afyonkarahisar cities was investigated. The effects of the track renewal and maintenance activities, improvements, degradations and the effects of the initial track quality to degradations were determined by the planned and unplanned surveys carried on the track using the standard deviation method mentioned in the EN:13848-5 standard.

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