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Oktavia, A., Tabitha, A.K. , Drajat, B. and Pujiyulianto, E. 2026. Analysis of Hardness Test and Microstructure Test of R.54 Type Railway Rail with Variations in Heat Treatment Cooling Media. Journal of Engineering and Scientific Research. 7, 2 (Jan. 2026), 63–77. DOI:https://doi.org/10.23960/jesr.v7i2.175.