That tradition has lasted well into beyond the millenium!
Too much like hard work trying to rubber gasket mount a window with the frame for a window vent also to fiddle with also.
Which is entirely understandable considering the sheer amount of glass that Glasgow has went through due to vandalism since what feels like the dawn of time.
I vagulely remember that Hendersons buses on the Motherwell to Newarthill SPT bus at night were suffering from attacks at night, which got to the stage where they were taken off for a while. Hendersons at the time had to invest heavily in CCTV for the buses and bandit screens for the drivers- which for such a small company was quite a large investment.
A fair few times buses to Castlemilk had to come off due to every bus going into the scheme losing windows.
First Glasgow has confirmed its zero tolerance approach to combating vandalism has produced dramatic improvements. Broken windows have been reduced from 8,000 about 10 years ago to just 750 for last year, the firm said. [...]
cbwmagazine.com
Some of the early build SVs and the ST Tigers that First ran in Glasgow- you were lucky on some of them to have a window vent on them sometimes, both of those types of buses were in horrific nick at the best of times as the vents were all replaced with plain glass, made worse in a Glasgow heatwave.
It used to also bug the hell out of me why on all the single decks Wrights only put the window vent hoppers in the low section of the bus and not the high up back section. Wasnt very pleasant when one of the many mutant lifeforms you get in Glasgow would smoke something at the back of the bus and it would waft across the entire bus. Or in a hot day when your up the back and sitting on top of a roasting hot engine and only getting ventilation when the bus was going at a moderate speed. But as mentioned earlier on in this thread this was probably influenced by problems in Northern Ireland.
Coming back onto topic, most bus routes in Glasgow involve some kind of hostile section of route.
Anyone for Kevin Bridges skectch on the old Number 40 bus from Clydebank to Easterhouse via Drumchapel.... that said all you need to know about bus travel in Glasgow.