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List of longest railway tunnels - Wikipedia
Gotthard Base Tunnel - Wikipedia
World’s longest road and rail tunnel is being built under the Baltic ...
The top 10 longest railway tunnels in the world
Longest Tunnels in the World (Top 21 Rail and Road Tunnels)
The world’s longest railway tunnels - Railway Technology
Rail Tunnels - an overview | ScienceDirect Topics
Hudson River Tunnel Project between New York and New Jersey
Rail tunnel embarks on 'trip under the sea' - China Daily
State, Union Pacific reach agreement for passenger rail, Moffat Tunnel