Rail lines are the length of railway route available for train service, irrespective of the number of parallel tracks.
| 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Azerbaijan | 2,116.0 | 2,122.0 | 2,079.1 | 2,079.3 | 2,068.1 | 2,068.1 | 2,066.4 | 2,067.8 | 2,074.0 | 2,132.0 | 2,133.1 | 2,139.9 | 2,239.2 | 2,138.9 |
| Georgia | 1,562.0 | 1,336.0 | 1,566.4 | 1,262.2 | 1,577.6 | 1,453.4 | 1,453.4 | 1,491.0 | 1,415.0 | 1,285.0 | 1,285.0 | 1,378.0 | 1,411.0 | 1,387.0 |
| Republic of Moldova | 1,139.0 | 1,075.0 | 1,156.9 | 1,156.9 | 1,156.9 | 1,156.9 | 1,156.0 | 1,151.0 | 1,151.0 | 1,151.0 | 1,151.0 | 1,151.0 | 1,151.0 | 1,149.0 |
| Ukraine | 22,302.0 | 22,001.0 | 21,705.0 | 21,665.4 | 21,642.5 | 21,625.9 | 21,625.9 | 20,975.2 | 21,603.0 | 21,625.9 | 21,625.9 | 21,625.9 | 21,625.9 |