Serpukhovsko–Timiryazevskaya line
| 9 Serpukhovsko–Timiryazevskaya line | |
|---|---|
 |
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| Overview | |
| Type | Rapid transit |
| System | Moscow Metro |
| Locale | Moscow |
| Termini |
Altufyevo (north) Bulvar Dmitriya Donskogo (south) |
| Stations | 25 |
| Daily ridership | 1,108,800 |
| Operation | |
| Opened | November 8, 1983 |
| Operator(s) | Moskovsky Metropoliten |
| Character | Underground |
| Rolling stock | 81-760/761 |
| Technical | |
| Line length | 41.5 kilometres (25.8 mi) |
| Track gauge | 1,520 mm (4 ft 11 27⁄32 in) |
| Electrification | Third rail |
The Serpukhovsko–Timiryazevskaya line (Russian: Серпухо́вско-Тимиря́зевская ли́ния, IPA: [sʲɪrpʊˈxofskə tʲɪmʲɪˈrʲazʲɪfskəjə ˈlʲinʲɪjə], Line 9), sometimes colloquially referred to as Grey Line (Russian: серая линия), is a line of the Moscow Metro. Originally opened in 1983, it was extended throughout the 1980s and early 90s and again in the early 2000s. With its current length of 41.5 km, it is the second longest line in the Moscow Metro (all underground making it the world's 4th longest rapid transit tunnel). There are 25 stations on the line.
The project of a north-south diameter was finalised in the 1971 Moscow General Development Plan, and construction began in the mid-1970s. The first stage, the southern Serpukhovsky radius, was opened in 1983 which brought the Metro to the southern districts of Danilovsky, Nagorny, Ziuzino and Chertanovo. Starting at Serpukhovskaya square the radius follows the Varshavskoye avenue, twice contacts the Moscow–Pavelets line, afterwards it deviates slightly westwards passing Azovskaya street, where it meets the then terminus of the Gorkovsko–Zamoskvoretskaya line, Kakhovskaya station. Afterwards the line crosses back across northern Chertanovo's main intersection (Balaklavsky avenue and Sevastopolsky Bulvar).
Some of the new technical methods employed in the construction of this section, included passing from deep alignment to shallow in water-carrying soils. A new technique of contour freezing was employed, which then used explosives to bore through the unstable region. The stretch between Serpukhovskaya and Tulskaya was further made difficult due gasoline leaks from an above petrol station over the years sufficiently absorbed by the soil such that the high concentration of fumes caused a fire in the unfinished tunnel, this introduced a new practice of adding additional boreholes in areas of difficult ventilation.
In November 1985 the line had its first extension southwards to Prazhskaya. This station was designed by Czechoslovak engineers and specialists from the Prague Metro. Simultaneously the station Moskevská was built in Prague by Soviet engineers.
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