D4 (Russian: МЦД-4) or Kaluzhsko-Nizhegorodsky Diameter (Russian: Калужско-Нижегородский диаметр) (previously known as Kiyevsko-Gorkovsky Diameter (Russian: Киевско-Горьковский диаметр) (Diameter 4; Green Diameter) is the fourth line of the Moscow Central Diameters which opened on 9 September 2023.

[1][2][3] Note: Greyed out stations are either still being built or are otherwise not open.

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