\r\nThe contract includes signalling and communications systems, electrification, and depot equipment, as well as platform screen doors at four stations. Siemens also will supply a fleet of 19 Avenio low-floor LRVs, which will be equipped with the Sitras HES system for catenary-free operation.\r\nEach roof-mounted Sitras HES module combines a double-layer capacitor with a NiMH battery, allowing the vehicle to store both traction and braking energy. Power converters transform the three-phase current with a rated voltage of 11kV into the 750V direct current required for charging the energy storage unit. The system will complete its charging cycle in just 20 seconds, taking power from charging points installed at each of the line's 25 stations, which will be fed by centralised rectifier substations.\r\nThe LRVs will also be adapted to operations in high temperatures, with a powerful air conditioning system and sun shades to protect roof-mounted electrical equipment from radiant heat. The 27.7m-long vehicles will feature a 2.55m-wide bodyshell and will accommodate up to 239 passengers.\r\nThe line will open in autumn 2015, and is a core part of the Qatar Foundation's plan to develop a car-free site at Education City.