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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cambodia | 601.0 | |||||||||||||
| China | 58,656.0 | 62,200.0 | 66,239.0 | 72,487.0 | 85,843.0 | 79,306.0 | 85,320.0 | 89,966.0 | 91,675.0 | 93,742.0 | 96,353.0 | 1,02,462.0 | 1,06,235.0 | 1,09,767.0 |
| Indonesia | 4,684.0 | 4,828.0 | 4,861.0 | 5,107.0 | 5,196.0 | 5,357.0 | 5,384.0 | 4,748.7 | 5,483.3 | 5,483.0 | ||||
| Japan | 20,140.3 | 20,087.4 | ||||||||||||
| Republic of Korea | 3,123.0 | 3,392.0 | 3,618.3 | 3,637.2 | 3,650.1 | 3,666.1 | 3,668.3 | 3,944.0 | 4,071.0 | 4,071.0 | 4,200.0 | 4,109.2 | 4,284.7 | 4,308.5 |
| Malaysia | 1,636.0 | 1,667.0 | 2,209.7 | 2,250.3 | 2,773.0 | 1,655.0 | 1,655.0 | 1,655.0 | 1,655.0 | |||||
| Philippines | 509.0 | 509.0 | ||||||||||||
| Thailand | 4,044.0 | 4,458.0 | 4,458.0 | 3,742.0 | 3,742.0 | 4,092.0 | ||||||||
| Viet Nam | 3,142.0 | 3,147.0 | 2,576.6 | 2,347.0 | 2,347.0 | 2,347.0 | 3,186.0 | 3,186.0 | 2,581.0 | 2,367.0 | 2,382.0 | 2,481.0 | 3,159.0 | 3,159.0 |