Claim: As of May 2020, the Sofia trolleybus fleet consisted of 129 trolleybuses, but the two most-produced past fleets were Skoda 9Tr, followed by ZiU-682.
Evidence: As of May 2020, the Sofia trolleybus fleet consisted of 129 trolleybuses. 70 ZiU-682 1986-2004 244 Skoda 9Tr 1964-1990