Transportation by rail in Kazakhstan is very important. Kazakhstan Railways provide 68% of all cargo and passenger traffic to over 57% of the country. 15,333 km in common carrier service, excluding industrial lines.Kazakhstan Temir Zholy is the national railway company.There is a small 8.56 km metro system in Almaty. A second and third metro lines are planned in the future.There is still a tram system which opened in 1937. However, with the metro construction, 8 of the 10 lines were closed and now there are only 2 lines. They total 23 km.The Astana Metro system is under construction. There are 2 tram lines in Temirtau. The motorways network in Kazakhstan is rather underdeveloped. Kazakhstan has a total of 97 airports. However, it is quoted as having a total of 449 airports in 2001.