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Due to construction planning of medium speed railway in Indonesia, a new standard of track quality is needed. The construction of medium speed railway with 160 km/h of highest speed concepted by Indonesian government require a thorough research and examination on construction technical, maintenance and operational pattern. And The most important thing that need to be thoroughly assessed is TQI as behalf of track quality. TQI is Track Quality Index that could be a standard to evaluating track quality. Another functions of TQI are degradation monitoring, determining maintenance method, summarising the whole track condition related to safety factor and ride comfort. TQI is obtained by measurement using special rollingstock i.e track geometry car. The recent TQI in Indonesia cannot made as standard on medium speed railway because it is only prevailed for 120 km/h of maximum speed on existing track. Hence, research and assessment is needed to determine a value of TQI. TQI is deviation values that summarised from 4 parameters i.e track gauge, cross level, longitudinal and lateral. The method used in this research is PT. KAI method by decreasing tolerance range of its parameters. Hopefully by using that method, the result of this research would considerable as reference of upcoming researches