The dissertation is aimed comparison of variables for evaluation of the quality of track geometry based on data from a measuring car for railway superstructure. The theoretical part of the thesis describes the maintenance and renewal strategies, the process of track degradation and the method of measuring and processing the track geometry and measuring equipment. In the practical part of the thesis, methods and procedures are described, which include a description of the sections of interest, the method of reading data and variables for assessing the quality of the track geometry. The rest of the practical part of the thesis consists of a summary of the results, where plots of the progression of the variables along the length and the progress over time, linear regression of the progress over time, as well as power spectral density (which is used for a frequency analysis of the track geometry) are presented.