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  1. List of longest railway tunnels - Wikipedia

  2. Gotthard Base Tunnel - Wikipedia

  3. World’s longest road and rail tunnel is being built under the Baltic ...

  4. The top 10 longest railway tunnels in the world

  5. Longest Tunnels in the World (Top 21 Rail and Road Tunnels)

  6. The world’s longest railway tunnels - Railway Technology

  7. Rail Tunnels - an overview | ScienceDirect Topics

  8. Hudson River Tunnel Project between New York and New Jersey

  9. Rail tunnel embarks on 'trip under the sea' - China Daily

  10. State, Union Pacific reach agreement for passenger rail, Moffat Tunnel