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Many people who first came to the Leningrad underground, there are surprised the presence of a very unusual plants with doors on platforms. However, there is an open platform, and not at all. Look such stops as the elevator doors to the site and called "gated stations." We are actively built in the city in the Soviet Union. Why do they need?
Today in St. Petersburg there are 12 closed-end stations. While 10 of them were built and opened in the days of the Soviet Union. Two more such stations have opened in 2018, on the eve of the World Cup. What is the secret of these stations? First, an important advantage of such platforms is that their construction is much cheaper and easier from an engineering point of view. Secondly, these plants are much safer stations open. In a crowded subway, especially at rush hour, incidents occur when someone slips on the rails or drops on to something out of things.
But why cheaper? Yes, it may seem that to build such a station, on the contrary, more difficult for the uninitiated. But this is not the case. During the construction of a gated stations, tunnel laid transit method for laying workers do not need to do rewiring prohodnicheskogo shield and turn. Secondly, because of the design eliminates the need to trim the tunnel walls.
So how does such a station? In fact, everything is very simple. The main difference lies in the fact that the train is in the tunnel. At these stations, the driver must stop in strictly designated place - not earlier, not later. All doors (and the station, and the train) opened simultaneously. But in the administration, the doors are closed alternately. First, the composition of the door are closed, and only then the door station. Synchronized opening and closing of doors using a special device on the platform. In ordinary situations, all making equipment, but if necessary, control of doors can take control of people at the Center.
The first station of this kind was opened in Leningrad in 1961. It was the "Victory Park". Another interesting fact that in the USSR, this type of station caught only in the northern capital. In the next 11 years was discovered just 10 stations on 2 lines of city subway. Ironically, although the construction of such a plant, and cheaper, but its service is more expensive. The reason for that is the whole apparatus which is responsible for the performance of the platform.
Continuing the theme 10 vertiginous stairs, move on which the guts unless crawling and not only.
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A source: https://novate.ru/blogs/120918/47753/