M4

Rarity: Common

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What Wikipedia says

The M4, officially referred to as the M4 Kadıköy - Sabiha Gökçen Airport metro line (Turkish: M4 Kadıköy–Sabiha Gökçen Havalimanı metro hattı), is a 33.5-kilometre (20.8 mi), 23-station rapid transit line of the Istanbul Metro. It is colored deep pink on the maps and route signs.

Excerpt from the Wikipedia article “M4 (Istanbul Metro)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ail Subway, CC BY-SA 3.0, via Wikimedia Commons.