Spezand–Taftan Line

The Spezand–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 632 kilometers (393 mi) to the Iranian border, a few kilometers further west of that station. It has 18 active stations of which 15 are in Pakistan and 3 are in Iran. 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. This section is very tough for maintenance due to Nushki Desert and Mountain Ranges.