Iran's first rail link to the outside world appeared simultaneously with the beginning of the country's railway system, as Iran's first major railway (1916) connected Tabriz with Jolfa on the border with the Russian Empire. The link continued its importance throughout the USSR era; Iran and the USSR signed an agreement on cross-border rail transport in 1940, and amended it in 1958. It is reported that during the late-Soviet era, some 350 railcars crossed the border at Jolfa daily, with the annual amount of cross-border freight reaching 3.5 million tons. However, after the breakup of the USSR and the closing of the border between Armenia and Azerbaijan the Jolfa connection became a dead end, as it only links Iran with the isolated Nakhichevan exclave of the Republic of Azerbaijan. In 2007, Iranian Railways, Azerbaijan State Railway and Russian Railways agreed on implementing the project to build a new line between Qazvin, Resht, Astara, Iran and Astara, Azerbaijan. In April 2017, Russia and India celebrated 70 years of diplomatic relations and vowed to complete the North-South Transportation Corridor (NSTC) with the help of Iran. The NSTC reduces time and cost of travel by 30-40%.There is presently no direct railway connection between Iran and Armenia, even though the two countries share a border. In 2009, Iran and Armenia agreed to build a railway linking Armenia with Iran's Persian Gulf ports.