The Riyadh Metro is a rapid transit system under construction in the city of Riyadh. It will consist of 6 metro lines spanning a total length of 176 km, with 85 stations. The project cost $22.5 billion to build. It is scheduled for a soft opening in 2019. The full network is expected to be fully operational in 2021. Siemens is supplying 45 4-car Inspiro trainsets for Line 1 and 29 2-car sets for Line 2. The first was unveiled in Vienna on 23 February 2016. Bombardier Transportation will deliver 47 Bombardier Innovia Metro train sets for Line 3. Alstom will deliver 69 Alstom Metropolis train sets for line 4, 5 and 6 of the Riyadh Metro. The first trainset was handed over to the ADA in March 2017. Each trainset is 36 meters long and can accommodate a maximum of 231 passengers. Trains are split into three classes – first, family, and single class – separated by glass partitions. The project includes the construction of an advanced center for the control and operation of the train traffic management and control and monitor all elements of the system of stations and tracks and facilities and systems, and will provide the center with the latest operating control and monitoring systems.