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The tunnels

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The tunnels.jpg Diagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boatDiagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boatDiagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boatDiagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boatDiagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boatDiagram of the Curtiss Flying Boat no. 2MiniaturesPlan of a large Chesapeake Bay sharpie taken from remains of boat

The tunnels are passages for trains under mountains, hills and rivers. The tunnels are dark but the trains are well lighted. Electric motors are often used, this avoids the smoke of steam engines which is very unpleasant in the tunnels.