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Asia's largest railway tunnel, about 6.5 km long, lies on which route?

AKalka-Shimla line
BDarjeeling line
CNilgiri line
DKonkan Railway
Answer & Solution
Correct answer: D. Konkan Railway
1. Konkan Railway is an engineering marvel. 2. It has nearly 2000 bridges. 3. Asia's largest tunnel, 6.5 km, is on it. _Source: syllabus Geography, India People and Economy, Chapter 10, Transport and Communication._
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