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The purpose of this paper is to assess experimentally system stability of the 154 kV transmission systems due to the current of the forthcoming ac high-speed railway (HSR) era. It introduces a simple method to evaluate the system stability. The proposed method shows the relationship between stability and power losses, and the stability indices made by the numerical process is used to assess whether a system can be stabilized or not. This paper also presents the improvement of the stability via loss reduction using STATCOM. Reactive power compensation is often the most effective way to improve both power transfer capability and system stability. The suitable modeling of the traction power system should be applicable to the PSS/E. In the case study, the proposed method is tested on a practical system of the Korea Electric Power Corporation (KEPCO) which is expected to accommodate the heavy HSR load. Furthermore, it proves that the compensation of voltage drop and its by-product, loss reduction is closely related to improvement of system stability.