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==In trolleybuses==
[[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, 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.
The design of the rotating joint was similar to that of a tram with rods and hinges; both trolleybuses would have their motors and brakes controlled by the driver in the front.<ref name=":0" /> They also allowed for coupling and decoupling in 3–5 minutes, which was intended such that at the end of peak hours, the trolleybuses could be split again into two. However, due to the abundance of trolleybuses and electricity, there was rarely a need to do so.<ref name=":0" />
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