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The tunnels

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The tunnels.jpg The TumbrelThumbnailsThe Turkish Treaty, 1920The TumbrelThumbnailsThe Turkish Treaty, 1920The TumbrelThumbnailsThe Turkish Treaty, 1920The TumbrelThumbnailsThe Turkish Treaty, 1920The TumbrelThumbnailsThe Turkish Treaty, 1920The TumbrelThumbnailsThe Turkish Treaty, 1920

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.