Line D1 (Moscow Central Diameters)

D1 (Russian: МЦД-1) or Belorussko-Savyolovsky Diameter (Russian: Белорусско-Савёловский диаметр) is the first of the Moscow Central Diameters, a suburban network in Moscow which uses the existing infrastructure of Moscow Railway and provides a regular connection between Moscow and surrounding cities. MCD-1 runs from Odintsovo via Moscow and Dolgoprudny to Lobnya.

Belorussko-Savyolovsky diameter
Lobnya Sheremetyevskaya Khlebnikovo Vodniki Dolgoprudnaya Novodachnaya Fare zone boundary Mark Lianozovo Ilimskaya Beskudnikovo Degunino Okruzhnaya Petrovsko-Razumovskaya Timiryazevskaya Dmitrovskaya Savyolovskaya Belorusskaya Begovaya Testovskaya Fili Slavyansky Bulvar Kuntsevskaya Rabochy Posyolok Setun Fare zone boundary Nemchinovka Skolkovo Bakovka Odintsovo

The line was opened on 21 November 2019, at the same day as D2. It uses the tracks and the stations of the Belorussky and the Savyolovsky suburban railway lines. The length of the line is 52 kilometres (32 mi), and the travel time between the termini is 80 minutes.[1] These suburban directions have been connected earlier, and through suburban trains were running between them, therefore the initial investment to open the line was minimum.[2]

Modified Ivolga trains have been serving the line since its opening.[2]