Dudullu-Bostancı(DB) rail system line is a public transport rail system line between Bostancı and Parseller stations. This line is designed and applied as double tube single line TBM tunnel in the length of 12.8 km and single tube double line NATM tunnel in the length of 1.4 km. Dudullu Bostancı subway line extended in North-south direction provides integration by intersecting the lines extending in east-west direction of Anatolian Coast in three points.
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