Saudi Arabia, with a population of over 22 million and one of the 25 largest economies in the world, needs a major railway project. SRO's chairman also revealed plans to acquire 16 new 80-seat carriages, and reported that all the existing 60 carriages had been refurbished. About 800,000 passengers use the railway line between Dammam and Riyadh every year. The new carriages are expected to increase this by 40 percent.