According to the official, test loudspeakers were installed at "Lesnaya" and "Svyatoshyno" stations, through which officials call upon passengers not to buy goods from illegal sellers in underground passages.
"Thanks to these measures we have overcome unauthorized trade on these two stations. Apart from loudspeakers, there are military guard offices on each station. If such innovation takes on, it will be applied on other metro stations," Shumak said.
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