Since the invention of the trolleybus, well over 200 different builders of trolleybuses have existed.
[1] This is a list of trolleybus manufacturers, both current and former.
Trolleybus garage (depot) in San Francisco, USA, with a range of
Muni
's trolleybuses dating from 1976 to 2003. On the left is an
ETI (Skoda/AAI)
14TrSF trolleybus, which type replaced the non-accessible
Flyer
trolleybuses in the center. On the right is an articulated
New Flyer
trolleybus, one of 60 articulated ETBs built by New Flyer for Muni in 1993-94
ZiU-9/682
is the most numerous trolleybus model in the world (over 42,000 trolleybuses were produced since 1972)