Rail lines are the length of railway route available for train service, irrespective of the number of parallel tracks.
Total route rail lines (km)
| 2000 | 2005 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 |
| Argentina | | 3,150.0 | 18,097.0 | 18,097.0 | | 17,609.0 | 17,609.0 | 17,866.0 | 17,866.0 | | |
| Paraguay | 441.0 | | | | | | | | | | |
| Uruguay | 2,993.0 | 2,993.0 | | 1,498.0 | 1,498.0 | 1,498.0 | 1,498.0 | 1,498.0 | 1,498.0 | 1,498.0 | 1,498.0 |