The aim of the project is to collect data and assess the impact of this new technology - the fixed track construction. Because there is no experience with behaviour of such a railway construction in Slovakia, it is necessary to monitor and diagnose it during railway development and operation. The regular monitoring of the fixed track construction creates opportunity to verify and analyse the measurements and diagnostic methods and technologies, which are based on determination of relative and absolute geometrical track position (GTP). The process of analysis of these methods consists from definition of accuracy and reliability of the observed results by using mathematical-statistical methods and expects a mutual comparison and results completion, which were obtained by standard railway equipment and by geodetic observations.