The two new metro lines will connect additional city districts and the international airport to the capital's mass transit network. The contract also includes the simultaneous extension of line 2 to the airport, the first phase of the future line 4.
The project includes six feeder stations, two 20 kV cable distribution rings, 37 station supplies and 21 rectifier substations (1.5kV, DC), as well as the SCADA (supervisory control and data acquisition) system for the electrical systems. Roughly 80 per cent of the energy required for rail electrification is provided by hydroelectric power plants, which Siemens says will help to reduce CO2 emissions.
