Narrow gauge railway in Pernik, Bulgaria.jpg
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Narrow gauge railway in Pernik, Bulgaria, Vehicles in Pernik, Lignite mines in Pernik, Narrow gauge rail vehicles of Bulgaria
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ja
ブルガリアの鉄道、ペルニクの車両、ペルニクの褐鉄鉱、ブルガリアの狭軌鉄道車両
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surface gauge narrow narrowing narrow gauge wire gauge gauge narrowed lignite narrowness strip mine