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Choose a Page:Which were the biggest locomotives...Who built the first locomotives?What were the first railways used for?What is the record speed for a train?What was the biggest gun train eve...When was the first underground rai...Which is the world's largest under...What does 'gauge' mean on railways?What is a monorail?How does streamlining speed up trains?Are steam trains still being built?What is the fastest train in use t...*Which are the longest rail and met...*What sort of motors power today's ... Which are the longest rail and metro tunnels? The longest rail tunnel is the Seikan rail tunnel, which runs under the Tsugaro Strait between Honshu and Hokkaido, Japan. It is 33.5 miles (53.85 km) long. The longest continuous metro tunnel is the Moscow metro, at 23.5 miles (37.9 km) long.   Previous: Back Book: 1001 Section: Science and Technology Chapter: Railways