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Inside the Struggle to Save Bulgaria's Last Narrow-Gauge Railroad - The New York Times
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Transport in Bulgaria - Wikipedia
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10 of the best scenic rail journeys in Europe: readers' tips | Rail travel | The Guardian
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maps - Bulgarian network
File:Railway map of South East Europe.png - Wikimedia Commons
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Narrow Gauge Line in Bulgaria Editorial Image - Image of gauge, narrow: 81203050
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Logistics as a historical force – Understanding Society
Bulgaria By Train | Bulgaria Train Routes | Eurail.com
