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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]], [[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 [[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 Volodymyr Veklych, 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|date=5 November 2015 |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 Veklych was borrowed by many trolleybus companies, in particular, Donetsk, [[Kherson]], [[Mykolaiv]], [[Trolleybuses in Minsk|Minsk]], [[Tallinn Tram and Trolleybus Company|Tallinn]], [[Riga]], [[Saint Petersburg|St. Petersburg]], [[Novosibirsk]] and many other cities.
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