Malaysia and Express Rail Link helped to fulfil CRCC’s staffing requirement to support operations. Beginning 2018, the contract once again held by China Railway Construction Corporation Limited after 3 years of operation by Prasarana. Train movements Construction history The line was claimed to be the world's fastest design in the world, at 22 months, 16 months if religious habit is taken into consideration. It was initially operated at 35% capacity with automatic train protection to assist manual driving. China Railway Construction Corporation Limited was responsible for infrastructure construction and systems integration under the 6.7-billion-riyal phase I contract which was awarded by the Saudi Arabian government in February 2009 following a visit by President Hu Jintao of China. CRCC carried out construction of the project infrastructure and integrated and subcontracted various systems. The line was built in only 21 months by about 8,000 skilled and unskilled workers and approximately 5,000 engineers. DBI (Deutsche Bahn International GmbH), a fully owned subsidiary of Deutsche Bahn AG and DAR Dar Al Handasah, were awarded with a contract from the Ministry of Municipalities and Rural Affairs of the Kingdom of Saudi Arabia to become the supervising engineers, responsible for design, construction, railway systems implementation and railway operations until today. Several subcontracts were awarded. Al-Muruj Electromechanical Co. was awarded MEP works at all 9 stations. Siemens provided the overhead line catenary system supplied at 1500 V DC. Westinghouse Platform Screen Doors supplied the platforms with screen doors, Siemens power supplies, and WS Atkins is responsible for electrical and mechanical systems and project management. Thales supplied SelTrac Communications-Based Train Control, an operations control centre, CCTV, SCADA and passenger information systems. Systra supervised the civil work. Serco provides operations and maintenance consultancy. TÜV Rheinland were the Independent Competent Person (ICP) on the project and provided safety, operations, training, fire and systems assurance consultancy support including the development of System-Wide, O&M Safety Case and HSQE Management Systems. TÜV Rheinland also secured the Operating Licence and Safety Certificate for acceptance by the Saudi Railway Commission (SRC) in 2011, 2012 and 2013. Air conditioning solution was provided by SKM Sharjah, UAE. The line is elevated at a height varying between and . Although the current metro uses conventional steel wheel on rail technology, it is sometimes incorrectly referred to as a 'monorail' due to cancellation on planned project in 2009. CRCC losses on contract In November 2010 CRCC claimed they had