Test runs have begun for Riyadh Metro's Line 4 in Saudi Arabia. 

French transport system provider Alstom revealed it has been conducting initial dynamic tests for the megaproject's Line 4 Depot Test Track, on which the FAST Consortium is working. 

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Tests cover the railway system's performance in terms of power supply and signalling, using trains that have already been delivered for the project, located in Saudi's capital city. 

Arriyadh Development Authority's (ADA) Riyadh Metro project comprises six lines spanning 176km, and features 85 metro stations. 

Alstom, part of the FAST Consortium, is delivering a fully integrated metro system for the project's Lines 4, 5, and 6. This includes 69 Metropolis-based Riyadh Metro trains, its Urbalis signalling system, a Hesop energy recovery station, and tracks. 

Riyadh Metro's Metropolis-based train features two cars per set, and spans 36m. Each train includes first, family, and single class compartments. 

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The driverless trains also feature a signalling system to control speed and door control. 

Commenting on the test run, Didier Pfleger, senior vice president for Alstom's Middle East and Africa operation, said: "This test run is a significant milestone for Alstom and for the project."