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 |
| Kazakhstan | 13,545.0 | 14,204.0 | 14,184.1 | 14,319.4 | 14,758.9 | 14,767.1 | 14,767.1 | 14,767.1 | 15,529.0 | 16,040.3 | 16,060.8 | 16,060.8 | 16,063.0 | 16,005.6 |
| Kyrgyzstan | 417.0 | 417.0 | 417.2 | 417.2 | 417.2 | 417.0 | 424.0 | 424.0 | 424.0 | 424.0 | 424.0 | 424.0 | 424.0 | 417.0 |
| Turkey | 8,671.0 | 8,697.0 | 9,594.0 | 9,642.0 | 9,642.0 | 9,718.0 | 10,087.0 | 10,131.0 | 10,131.0 | 10,207.0 | 10,315.0 | 10,378.0 | 10,378.0 | 10,546.0 |