| 21. | Three prototype trolleybuses were delivered in December 1995 and January 1996.
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| 22. | After 2007 the tram line was replaced by a trolleybus line.
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| 23. | Based on the Chavdar 130, a trolleybus prototype was manufactured.
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| 24. | Most of the current trolleybus network infrastructure was built before 1960.
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| 25. | The main products were tackles, but also trolleybuses and excavators.
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| 26. | The first operational trolleybus service was introduced in 1933 in Moscow.
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| 27. | In the years 1983-95, the trolleybus appeared again.
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| 28. | However, all trolleybus service in Tehran was discontinued around 2013.
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| 29. | The Ernst Werner von Siemens in his experimental Electromote trolleybus concept.
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| 30. | The trolleybus network closed in July 1963 replaced by motor buses.
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