Why in the Leningrad subway built stations with doors on the platform?

The newcomer, hitting the St. Petersburg metro station for the first time at a “closed-type” station, is usually surprised: what is your elevator here and where, in fact, do the trains stop? They stop there, behind closed doors. This was built only in the 60-70s and a little now.
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In St. Petersburg, 12 stations are closed. 10 were opened in Soviet times and two more - on the eve of the World Cup in 2018. Comparison with elevators is not without common sense. Another name for such stations is “horizontal lift”.
Closed-type station is much cheaper in design and construction. The train does not leave the station, as such, it remains behind the wall, inside the "pipe".
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In Soviet Leningrad for some time they decided to build like this, because it is, firstly, cheaper and, secondly, safer. Double doors protect passengers from falling under the train. Well, then it is technologically - a new type of station used the achievements of Soviet automatics to the maximum.
What is the savings in construction? Firstly, the station's distillation tunnels are laid in transit, without turning and re-installing the tunnel shield. Secondly, there is no need to finish the station tunnels.
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How does the station work? The train, as you already understood, remains in the tunnel. He must stop at the station strictly in the designated place so that the doors of the cars coincide with the station doors. Then the doors open synchronously. When the train leaves the station, they first close the doors of the car, then the station doors.
The combination of the doors of the train and the station is made by the driver on the illuminated sign "Stop the first car." A special device synchronizes the time, sequence and speed of opening and closing doors of cars and stations. Opening of doors can be made both automatically, and from the control panel for the driver.
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The first station with “double doors” was opened in 1961. It was the "Victory Park" in Leningrad. By the way, this type of station got accustomed only in the city on the Neva. For 11 years, 10 such stations have been opened - four on the second line and another six on the third.
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Later, the subway builders learned how to build single-vaulted stations, which were even cheaper.
Lyrical digression. There are types of designs of metro stations.One-vaulted stations - one of the varieties. Such stations were also invented in Leningrad. They represent a one-volume hall, in which the island platform is located, paths and sub-platform rooms. At such stations there are no columns. Metrostroiteli divide them at the station shallow and deep. In St. Petersburg there are many single-vaulted deep-laid stations, in Moscow there is only one - Timiryazevskaya.
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But back to the closed-type stations. It quickly became clear that it might be cheaper to build such a station, but double-door mechanisms are quite expensive to maintain. In general, in Russia until recently there were 10 stations built in Leningrad from 1961 to 1972.
But unexpectedly in 2018, it turned out that Begovaya and Novokrestovskaya stations opened in St. Petersburg for the World Cup were also “double doors”. Although they can not be called closed-type stations. By and large, these are ordinary multi-span column stations, but between the train and the platform there is a glass wall with glass doors.
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Why were they built like that, you ask? After all, no savings.First, on the third line, where Begovaya and Novokrestovskaya are located, the majority of the station has “double doors”. We decided to maintain uniformity. Secondly, security. Novokrestovskaya station is located near the stadium, and there are crowds there.
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