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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Azerbaijão | 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 |
| Cazaquistão | 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 |
| Quirquistão | 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 |
| Turquia | 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 |