Came across this video on YouTube showing some shots of the electric trolleybuses in May 1991. Some nice shots of the Eaton Centre/Jackson Square/Gore Park area (starting around 3:30 mark).
• Video Link
Source: Michael Taylor on YouTube
(link)
Not sure if this video has been posted in this thread yet, apologies if it has been already. The video's author has some additional videos of the Barton trolley route from around the same time on their page.