The FLOW CONSORTIUM is an alliance of 3 major multi-national companies that have many years of railway O&M expertise and an extensive global Railway Management, Operation and Maintenance project portfolio and experience. They have joined efforts in Saudi Arabia to operate and maintain the Riyadh Metro Project’s network lines 3,4,5 and 6.

The LINE 4 has a total track length of 29.45 Kms of which 16.7 Kms running on elevated viaducts (bridges), 5.6 Kms running underground in tunnels and 7.1 Kms running at grade (street level). The line has one depot which is shared with line 6. The depots are where the trains are stationed when they are not in service and when they need maintenance.

The LINE 6 has three Interchange stations; with the Blue line 1 and Yellow Line 4 at King Abdullah Financial District Station, with the Red Line 2 at Al-Hamra Station and with the Orange Line 3 at Al-Naseem Station.