The Georgian railways represent an important transport artery for the Caucasus, as they make up the largest proportion of a route linking the Black and Caspian Seas. In turn, this has allowed them to benefit in recent years from increased energy exports from neighbouring Azerbaijan to the European Union, Ukraine, and Turkey. Passenger services are operated by the state-owned Georgian Railway whilst freight operations are carried out by a number of licensed operators. Since 2004 the Georgian Railways have been undergoing a rolling programme of fleet-renewal and managerial restructuring which is aimed at making the service provided more efficient and comfortable for passengers. Infrastructural development has also been high on the agenda for the railways, with the key Tbilisi railway junction expected to undergo major reorganization in the near future. Additional projects also include the construction of the economically important Kars–Tbilisi–Baku railway, which was opened on 30 October 2017 and connects much of the Caucasus with Turkey by standard gauge railway.