[[File:СМЕ из ЗиУ-9 в Ленинграде.jpg|thumb|Two [[ZiU-9]] trolleybuses operating in multiple-unit control in [[Saint Petersburg|Leningrad]], [[Soviet Union|USSR]]]]
In the [[USSR]], increased capacity in public transport was necessary, but the local industry had not developed sufficiently to match world trends, such as by the production of articulated trolleybuses[[trolleybus]]es, the first of which was the SVARZ-TS, built in 1959 to 1967. It was not until 1963 that the next articulated trolleybus was produced, the [[ZIU-683|ZiU-683]].<ref name=":0">{{Cite web|title=Троллейбусные поезда: советская транспортная экзотика|url=http://www.gruzovikpress.ru/article/13591-trolleybusnye-poezda-sovetskaya-transportnaya-ekzotika/|access-date=2021-07-09|website=[[Gruzovik Press]]}}</ref> Hence, during this period, to satisfy passenger demand, research started to produce trolleybuses connected in multiple working, which had first successfully run in [[Kyiv]] on June 12, 1966. This system was designed by Ukrainian engineer Vladimir Veklich, and connected two [[MTB-82|MTB-82D]] trolleybuses.<ref>{{Cite web|title=Именно по Киеву курсировали первые в мире троллейбусные поезда|url=https://fakty.ua/208269-trollejbus|access-date=2021-07-09|website=fakty.ua|language=uk}}</ref> Although other cities had tried to engineer similar systems, their solutions often resulted in rapid wear of traction motors, due to the vehicles never being intended for such use.<ref name=":0" />
So the invention by Veklich was borrowed by many trolleybus companies, in particular, Donetsk, Kherson, Nikolaev, Minsk, Tallinn, Riga, Leningrad (now St. Petersburg), Novosibirsk and many other cities.
