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In page Central Organisation for Railway Electrification:

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The 220-132-25 kV power-supply network for electrification extends along the track for about 200 to 300 kilometres (120 to 190 mi). It is remotely controlled from the division control centre to ensure an uninterrupted power supply to the track overhead equipment. In electrification projects, a microprocessor-based supervisory control and data acquisition control system is replacing the earlier electro-mechanical Strowger system of remote-control equipment. SCADA can telemeter voltage, current, maximum demand and power factor in real-time, enabling control of maximum demand and electrical cost. The system also provides automatic troubleshooting and isolation of faulty sections.[citation needed]