In this note results of a performance study of the tracking system of the proposed TESLA detector are presented based on a realistic track reconstruction package. The code used was developed from existing FORTRAN and C packages from LEP experiments, which were modified to match the different detector specification and backgrouind levels of a next generation linear collider detector. In the article performance issues of the charged track reconstruction system as well as detector resolution aspects are addressed. The track reconstruction operates on a detailed GEANT-based simulation of the TESLA detector proposal, including full simulation of the expected beam-related background in all subdetectors.