Claim: As of May 2020, the Sofia trolleybus fleet consisted of 129 trolleybuses, but the two most-produced past fleets were Skoda 9Tr, which had 244 quantities from 1964 to 1990, followed by ZiU-682 which had 70 quantities produced from 1986 to 2004.
Evidence: As of May 2020, the Sofia trolleybus fleet consisted of 129 trolleybuses. Skoda 9Tr 244 1964-1990 ZiU-682 70 1986-2004 2 26 67 12 3 11 8 20 23 1