This tunnel connects the "Ring" line and "Lyudminsko - Dmitrovskaya" line. Was opened in 1985 in the areas of the Voljskaya - Chkalovskaya. Until the opening of the next segment, in 2007, Chkalovskaya - Trubnaya, trunk served as a dead end for circulating LDL. However, and after the opening, the NE is often used for parking trains from both LDL and for the Circle line. This staffing coverage during the day is only at the conventions.
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