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Moscow Central Diameters

Another system, which forms "genuine S-Bahn " as in "suburbia-city-suburbia"-designed railway, is the Moscow Central Diameters, a pass-through railways system, created by constructing bypasses from "vokzals" final stations (e.g. by avoiding the central stations of already existing Moscow Railway, used for both intercity and urban-suburban travel before) and forming a train line across Moscow's centre.

Out of 5 projected lines, the first 2 lines were completed and launched on 2019-11-21 (e.g. November 21, 2019).

While using the same rails as "regular" suburban trains to vokzals, MCD trains (" Ivolga " model) got distinguishing features (shape; red cabin, different windows, lesser amount of seats; big red "MЦΔ" train logo).