The Tagansko–Krasnopresnenskaya line (, , formerly Zhdanovsko-Krasnopresnenskaya () (Line 7) is the busiest line of the Moscow Metro. Built in 1966–1975 and extended in 2013–15, it cuts Moscow on a northwest-southeast axis and contains 23 stations. History Tagansko–Krasnopresnenskaya line is a classic example of Soviet urban planning, sometimes referred to as the seventh stage of the Metro. Construction began in the early 1960s, and in 1966 the first complete segment was opened. In the practice of Moscow radial line openings, it began at the ring and left through to the new housing massifs on the southeast of Moscow, originally called the Zhdanovskaya line (Ждановская линия). The construction of the new radius was designed to maximize the efficiency of it with the land-based transportation. All the stations were built on major transport links and the stations Tekstilschiki and Vykhino were integrated into a single transport complex with the railroad stations. The path began at the Taganka Square (on the ring) and followed the Marxist street/Volgograd avenue through the neighbourhoods of Pechatniki, Kuzminki and Tekstilshchiki. On its final stretch, the line deviates from the Volgograd avenue and crosses onto the Ryazan avenue and terminates at a combined cross-platform transfer to the railways at Vykhino. Although the geology of the line was unfavourable, so to cut down costs, the builders adopted a cut-and-cover method for tunnel construction building them out of large concrete boxes. In some cases, like the second stretch of the Volgogrdsky Prospekt-Tekstilshchiki path, in a rare occurrence for Moscow, the track goes on the surface, as with the approach to Vykhino. In a similar logic that was shown when building the Kaluzhsko–Rizhskaya line, it was decided to postpone the central section in favour of building the new radial line, however after the opening of the new Zhdanovskaya line in late 1966, the passenger traffic between it and the former Kaluzhskaya line overstretched the capacity of the ring between Oktyabrskaya and Taganskaya. The two presented itself a unique opportunity and in late 1970 Moscow Metro's first cross-platform transfer point was opened at Kitay-Gorod. Construction of the Krasnopresnensky radius was in built in much more difficult conditions, in a similar fashion it was designed to make the new massifs of the northwestern Moscow accessible, however the more dense regions, underground fortifications and communication lines that the builders had to face, the first stage of the Krasnopresnensky radius knows no equals in the