India's first bullet train corridor gets advanced electrification system
The National High Speed Rail Corporation Limited (NHSRCL) announced on Wednesday that the Mumbai-Ahmedabad High Speed Rail corridor is being equipped with an advanced Overhead Traction System. This 2×25 kV system is one of the most sophisticated railway electrification technologies used worldwide for high-speed rail and is being introduced in India for the first time.
The system is designed to provide a stable and uninterrupted power supply required for trains operating at speeds of up to 320 kmph. Electrification works are progressing alongside civil construction and track-laying on the 508-km corridor.
Electricity will flow from the National Power Grid to specially designed Grid Substations and then to 14 traction substations strategically located along the corridor. Five traction substations are in Maharashtra—Mumbai, Thane, Virar, Boisar and Thane Depot—while nine are in Gujarat—Vapi, Bilimora, Surat, Bharuch, Vadodara, Anand, Mahemdabad, Ahmedabad and Sabarmati Depot.
These substations will feed power to different sections of the route, ensuring seamless transition in power supply as the train moves. The corridor will also have 31 switching posts to ensure uninterrupted power supply and enable rapid isolation of faults when needed.
In addition, 16 distribution substations are being constructed to supply electricity to stations, signalling systems, maintenance facilities and other operational infrastructure.
The trains will run on a network of overhead electrical wires supported by nearly 22,000 steel masts and over 25,700 cantilever assemblies spread across 1,125 track kilometres (including depots). The masts stand between 10.5 and 14.5 metres high—roughly the height of a three to four-storey building. They will support an advanced compound catenary system, another technology being deployed in India for the first time. Every wire is installed under precisely calculated mechanical tension to enable the train’s pantograph to collect electricity smoothly and continuously without sparks or power fluctuations.
NHSRCL said there has been extensive indigenisation of critical electrical infrastructure. Several major components are now manufactured in India, including all major transformers, cross-arms mounted on OHE masts, ground wire, protection wire and feeder wire. Many components related to the Traction Power Supply System, Distribution Power System and Electro-Mechanical works are also being produced domestically.
Each of the 14 traction substations will be equipped with Early Earthquake Detection Seismometers, capable of detecting seismic activity and initiating protective actions within seconds to stop trains in the event of an earthquake. A total of 28 seismometers are being installed—22 along the high-speed corridor at traction substations and switching posts, and six additional inland seismometers in earthquake-prone regions of Maharashtra and Gujarat. Of these, 12 will be in Maharashtra and 16 in Gujarat.
