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Detailed explanation-1: -Vice-President M Venkaiah Naidu dedicated the country’s longest electrified rail tunnel between Cherlopalli and Rapuru in Andhra Pradesh. He also inaugurated electrified railway line between Venkatachalam and Obulavaripalli at Gudur railway station and also flagged off Gudur-Vijayawada inter-city superfast express.

Detailed explanation-2: -Venkaiah Naidu on Sunday inaugurated India’s longest electrified rail tunnel. Situated between Cherlopalli and Rapuru stations of Andhra Pradesh, the 6.6-km long tunnel is a part of the Obulavaripalli-Venkatachalam railway line.

Detailed explanation-3: -The 6.6km long tunnel is a part of 113 kms Obulavaripalli – Venkatachalam – Krishnapatnam Port railway line. The tunnel, an engineering marvel, has reduced the distance by 72 kms for the trains coming from Guntakal Division to Krishnapatnam.

Detailed explanation-4: -The Gotthard Base Tunnel (GBT; German: Gotthard-Basistunnel, Italian: Galleria di base del San Gottardo, Romansh: Tunnel da basa dal Sogn Gottard) is a railway tunnel through the Alps in Switzerland. It opened in June 2016 and full service began the following December.

Detailed explanation-5: -India’s longest electrified rail tunnel has been constructed in Andhra Pradesh and it is shaped like a horseshoe. Situated between Cherlopalli and Rapuru stations in Andhra Pradesh, the tunnel is 6.6 kilometres long and has been built at a cost of Rs 460 crore.