Rail lines are the length of railway route available for train service, irrespective of the number of parallel tracks.
Rail lines (km)
| 2000 | 2005 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 |
| Argentina | | 3,150 | 18,097 | 18,097 | | 17,609 | 17,609 | 17,866 | 17,866 | | |
| Chile | 2,035 | 2,120 | | | | | 2,057 | 2,396 | 2,396 | 2,396 | 2,396 |
| Cuba | 4,252 | 4,065 | | | | | | | | | |
| Ecuador | 956 | | | | | | | | | | |
| Panama | 485 | | | | | | | | | | |
| Paraguay | 441 | | | | | | | | | | |
| Uruguay | 2,993 | 2,993 | | 1,498 | 1,498 | 1,498 | 1,498 | 1,498 | 1,498 | 1,498 | 1,498 |
| Venezuela (Bolivarian Republic of) | 336 | 336 | | | | | | | | | |