longest running train of india
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prayagraj express
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tamilnadu express
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himsagar express
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karanataka express
C
Correct answer
Explanation
The Himsagar Express is India's longest-running train by distance, covering 3,745 km from Kanyakumari (Tamil Nadu) to Shri Mata Vaishno Devi Katra (Jammu and Kashmir) over approximately 72 hours. Vivaradi Express covers similar distance but Himsagar is longer.