The Saudi Railways Organization (SRO) () is one of two state-owned companies that operates Saudi Arabia's rail network along with Saudi Railway Company. The SRO operates a network of railways with a total length of approximately 1,380 kilometers. The network consists of two main lines. A 449 km passenger line that links Dammam with Riyadh, and a 556 km freight line that connects the King Abdul Aziz Port in Dammam with Riyadh. In addition, about 373 km of auxiliary lines branch from SRO's main lines and connect some industrial and agricultural areas, and military sites, with export ports and residential areas.