Carrying out accurate and reliable track maintenance tasks is very important to improve the running safety of a railway vehicle and the ride quality for the passenger. For this purpose, appropriate track management standards need to be set by analyzing the field test results for setting reliable management criteria. However, in practice, it is difficult to quantitatively examine the various track fault conditions. Therefore, investigation of the influence of various track characteristics on the running safety and ride quality was performed through numerical analysis method. The influence of the track irregularities on the wheel lateral forces, derailment coefficients, and accelerations on the bogie and car body was investigated through numerical analysis.