Investigation of the performance of rail freight: a regression model with panel data. Research, Society and Development, [S. l.], v. 8, n. 11, p. e088111435, 2019. DOI: 10.33448/rsd-v8i11.1435. Disponível em: https://ojs34.rsdjournal.org/index.php/rsd/article/view/1435. Acesso em: 28 jun. 2025.