It seems this part mapped is already constructed, per official website: https://www.csn.com.br/quem-somos/grupo-csn/tlsa/

Also, on Youtube, 2 days ago someone posted a video that the railway is just 5 km away from Acopiara city center: https://www.youtube.com/watch?v=5ZAViTCoTyM

So perhaps the tagging is supposed to be railway indeed, instead of construction?