Most of Tajikistan's transportation system was built during the Soviet era, and since that time the system has deteriorated badly because of insufficient investment and maintenance. In 2013, Tajikistan, like many of the other Central Asian countries, was experiencing major development in its transportation sector. Beginning in 2005, a series of major transportation projects were begun. The first such project, the Anzob Tunnel, was inaugurated in 2006, providing a year-round road link from Dushanbe to northern Tajikistan.
In 2009 Tajikistan had 26 airports, 18 of which had paved runways, of which two had runways longer than 3,000 meters. Tajikistan has two domestic airlines (Tajik Air and Somon Air) and is also serviced by foreign air companies (mainly Russian). The country's main airport is Dushanbe International Airport which, as of May 2014, had regularly scheduled flights to such major cities as Almaty, Baku, Bishkek, Delhi, Dubai, Frankfurt, Istanbul, Kabul, Moscow, Saint Petersburg, Sharjah, Tehran, and Ürümqi amongst others.
No flights connect Dushanbe with Tashkent. The next largest airports behind Dushanbe are at Khujand and Kulob. As of 2007 air transport was said to be unreliable.
The railroad system totals only 680 kilometres (420 mi) of track, all of it 1,520 mm (4 ft 11 27⁄32 in) broad gauge. The principle segments are in the southwestern region and connect the capital with the industrial areas of the Gissar and Vakhsh valleys and with Uzbekistan, Turkmenistan, Kazakhstan and Russia. In 2000 a new line, the Qurghonteppa – Kulyab railway, was completed and connected the Kulyab District with the central area of the country. Passenger transit through Tajikistan has been hindered by periodic failures of Tajik Railways to pay transit tariffs and by safety issues. Most international freight traffic is carried by train.