 The cargo line is a 556 kilometer line that begins at the King Abdul Aziz Port in Dammam and passes through Al-Ahsa, Abqaiq, Al-Kharj, Haradh and Al-Tawdhihiyah, before terminating in Riyadh.Planning for the line started in 1947 with an agreement between King Ibn Saud and ARAMCO to lay a 547 km (about 340 mi) freight line.Bechtel Construction Company was chosen to build the rail line and a sea port at the eastern end of the rail line at Dammam.