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![Entrance to Alaska's Whittier Tunnel, a unique 4km tunnel that uses scheduling to share a single lane between both road vehicles and trains [1024x768] : r/InfrastructurePorn](https://external-preview.redd.it/WynMZrg8X2YmzU3seejvmg-1fiA5aiz_kVqYuvRd7Bc.jpg?auto=webp&s=23951245e71fee77431e07013eae91619a2ede8c "Entrance to Alaska's Whittier Tunnel, a unique 4km tunnel that uses scheduling to share a single lane between both road vehicles and trains [1024x768] : r/InfrastructurePorn")