WAHJONO, Hari Boedi; PERMANA, Adinda Cahya. Hardness Testing And Macro Photo Observation Automatic Surface Treatment Rail With Variation Of Heating Torch Distance And Cooling Nozzle. Jurnal Perkeretaapian Indonesia (Indonesian Railway Journal), [S. l.], v. 5, n. 2, p. 46–54, 2021. DOI: 10.37367/jpi.v5i2.158. Disponível em: https://jurnal.ppi.ac.id/jpi/article/view/158. Acesso em: 4 jun. 2026.