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 | 2,122 | 2,079 | 2,079 | 2,068 | 2,068 | 2,066 | 2,068 | 2,074 | 2,132 | 2,133 | 2,140 | 2,239 | 2,139 |
| Georgia | 1,562 | 1,336 | 1,566 | 1,262 | 1,578 | 1,453 | 1,453 | 1,491 | 1,415 | 1,285 | 1,285 | 1,378 | 1,411 | 1,387 |
| Republic of Moldova | 1,139 | 1,075 | 1,157 | 1,157 | 1,157 | 1,157 | 1,156 | 1,151 | 1,151 | 1,151 | 1,151 | 1,151 | 1,151 | 1,149 |
| Ukraine | 22,302 | 22,001 | 21,705 | 21,665 | 21,643 | 21,626 | 21,626 | 20,975 | 21,603 | 21,626 | 21,626 | 21,626 | 21,626 |