> sometimes trolleybuses were used.

You've gotten very lucky with this shot. I tracked this run on line for a few days in 2018, but didn't see any trolleybuses.

Yes. Lucky indeed. At this time. Lines 7 and 8 were being run with diesels due to construction. Line 4 was the only trolley line. Unlike previous trips, the rush hour runs over routes 1 and 2 did actually use trolleys. In the AM and PM there was a run that did one full trip on the wired part of Route 1 and then one trip in the wired part of Route 2. There were barely any other passengers in the bus. The Operator in the afternoon was very friendly and stopped in many places so we could take photoe. A few months later, these trips were cancelled.