Line D4 (Moscow Central Diameters)
| Kaluzhsko-Nizhegorodsky Diameter | |
|---|---|
| Overview | |
| Native name | Калужско-Нижегородский диаметр |
| Status | Operating |
| Owner | Government of Russia |
| Locale | Moscow |
| Termini |
|
| Stations | 38 |
| Service | |
| Type | Commuter rail |
| System | Moscow Central Diameters |
| Operator(s) | Central Suburban Passenger Company |
| Rolling stock | EG2Tv, EP2D, EP2DM |
| History | |
| Opened | 9 September 2023 |
| Technical | |
| Line length | 86 km (53 mi) |
| Track gauge | 1,520 mm (4 ft 11+27⁄32 in) Russian gauge |
| Electrification | 3 kV DC |
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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.