Written by Talent KAS

Related Topics: Infrastructure Development, Regional Connectivity


Vice President M. Venkaiah Naidu has inaugurated India’s longest electrified rail tunnel.


  • The tunnel is situated between Cherlopalli and Rapuru stations of Andhra Pradesh.
  • The 6 km long tunnel is part of the recently completed Obulavaripalli-Venkatachalam new railway line.


  • It is built in the shape of a ‘horse shoe’ using the New Austrian Tunneling Method (NATM).
  • The tunnel construction was completed in a record time of 43 months and was built at a cost of ₹437 crore.
  • The height of tunnel (rail level to roof) is 5 meters and the minimum height of contact wire is maintained at 5.2 meters.
  • The track is constructed without using Ballast by providing Bi-block sleepers and Vaslo fittings.
  • Two sub-stations for supply of electric traction power are provided near Cherlopalli and Adurupalli with necessary switching stations in between.
  • There are LED lights at an interval of every 10 metres inside the travel.


  • The newly constructed tunnel will provide seamless rail connectivity between Krishnapatnam Port and the hinterland areas for freight movement.
  • The 112-km long electrified railway line between Venkatachalam and Obulavaripalli will reduce the travel time by 5 hours.
[Source: The Hindu, Livemint]

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