 Several development projects have been completed since then, including an extension of the line to Riyadh, construction of several passenger terminals and the opening of a dry port in Riyadh.The SRO operates a network of railways with a total length of approximately 1,380 kilometers.Two main lines connect King Abdul Aziz Port in Dammam with Riyadh, while the other connects the city of Dammam with Riyadh.