Quetta–Taftan Line
The Quetta–Taftan Railway Line () (also referred as Main Line 4 or ML-4) is one of four main railway lines in Pakistan, operated and maintained by Pakistan Railways. Inward from Pakistan's most western edge it begins at Quetta station and has services that continue beyond Koh-e-Taftan station in high mountains, west. Its length is to the Iranian border, a few kilometers further west of that station. It has 23 active stations including Quetta, being an interchange, and Taftan, Balochistan, northeast of the dark volcano peak, Taftan. Many or all main services since 1940 (and  1922 to 1931) terminate on the natural continuation in eastern Iran at the high city of Zahedan, which sees a change of gauge (of track and rolling stock) for accessing the Trans-Iranian Railway. History. Originally known as the "Trans–Baluchistan Railway", the line was built as part of a strategic military route between British India (specifically the part now Pakistan) and Persia (now Iran). The Quetta to Nushki branch was approved by Lord George Hamilton, Secretary of State for India, in August 1902, and it was opened on 15 November, 1905. The part west of Nushki towards Iran was  named the Nushki Extension Railway. Work started on it in September 1916 under the charge of P.C. Young as Engineer-in-Chief and it reached the Iranian town of Duzdap (now Zahedan, a small city) on 1 October, 1922. By the time the railway reached Duzdap, the British had already demobilized their forces in East Persia in March 1921 which took away the importance of the newly built part. So much so that in 1931, the 221–kilometer section between Nok Kundi and Duzdap (Zahedan) was closed and track removed to be used elsewhere. World War II however, renewed interest  in the Quetta-Zahedan link. British forces wanted to aid the Soviet forces by supplying material through Persia. Aid through Persia proved unnecessary (due to successful Arctic convoys of World War II and similar supplies) but the Quetta-Zahedan link was reopened on 20 April 1940 in Zahedan. Stations. The stations are: