Article Detail Longest rail tunnel in the world ? Answer: Seikan Tunnel (Japan - 53.9 Km) Similar Questions : 1. Which is the longest road in India ? Answer: Grand Trunk Road (2500 Km) 2. Where is largest Archipelago ? Answer: Indonesia 3. Which is Longest Dam in India ? Answer: Hirakod Dam (Orissa) 4. Which is largest continent ? Answer: Asia 5. Which is longest railway station ? Answer: Grand Central Terminal, Chicago(USA). 6. Which is Longest road tunnel in the World ? Answer: Lærdal Tunnel (Norway - 24.51 kilometre) 7. Which is longest river in world ? Answer: Nile, Africa Read more from - Longest and Largest