Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Vasil Levski Stadium Metro Station (Bulgarian: Метростанция „Стадион „Васил Левски“) is a station on the Sofia Metro in Bulgaria. It was introduced into service on 8 May 2009. It serves the Vasil Levski National Stadium and New CSKA Sofia Stadium. The architectural layout was created by architects Kr. Andreev and D. Mushev.
Automatic Platform Screen Door (APSD)
In August 2020, testing of the first automatic Platform screen doors (Rope-type Screen Door) commenced at the Vasil Levski Stadium Metro Station of the Sofia Metro. These safety barriers are intended for greater safety of passengers. Automatic partition doors on the existing Line 1, in addition to the Vasil Levski Stadium Metro Station, are also being built at the Opalchenska Metro Station. By 2022, this RSD system will be implemented at first 12 stations of the Line 1 and Line 2 of the Sofia Metro.