The use and need of railway transportation system is increasing due to different reasons;rnit uses less energy, environmental friendly, high speed and huge capacity. The incrementrnof axle loads leads to the design of high quality track structure materials in order tornenhance the life span of the line. Even though, the track structure is designed for a longerrndesign period, its performance is reduced from time to time. For this reason the status ofrnthe structure should be assessed periodically. The aim of this research is to analyze therntrack geometry quality index of Addis Ababa Light Rail Transit (AALRT).In order tornconduct this research deterministic statistical method was used. The track quality indexrnmodel was developed using multiple linear regression analysis. In this method the averagerntrack irregularities of cross level, alignment, twist and gauge parameters were used as anrnindependent variable whereas the track quality index was used as a dependent variable orrnresponse. The result showed that most of the common track irregularities in AALRT wererncross level and gauge irregularities which cover 60 % and 32 % of the total irregularityrnpercentage respectively. The research found that the maximum value of track quality indexrnis 9.51 mm which was 63.4 % of the threshold limit (15mm). The rate of change of trackrnquality indices were calculated for twelve segments. The maximum rate of change of trackrnquality indices (track deterioration rates) was 7.54 mm/yr which was found in curves withrnembankment (ballasted track). Finally, the adequacy of the developed track quality indexrnmodel was checked based on the assumptions of multiple linear regression and also it isrnvalidated using variance inflation factor (VIF).The VIF values of the four independentrnvariables; i.e., cross level, alignment, twist and gauge irregularities are 1.12, 1.11, 1.03rnand 1.08 respectively were less than 5. As a result, the model is valid and can be used inrnthe future to show the status of the track and manage track maintenance activities.