What else from other cities around the world do you feel can relate to this which have gone, or soon to be going?
For Glasgow:
The Leyland Atlantean, known far more commonly in the city as the LA. Glasgow Corporation and it's various successors ordered and operated over 1,400 examples for over 40 years, the first one arriving when the city still had a sizable tram network. Very much the second 'Glasgow Standard' which evolved as the first one did over it's production lifespan.
The Class 303s/311s aka the 'Glasgow Blue Trains': the face of modern train travel in the 1960s in the Glasgow/Strathclyde region and an enduring symbol of the city's transport heritage, even 21 years after the last sets were withdrawn. The plethora of sounds they emitted, the creaks and groans, the clattering Gresley bogies... I could go on and on.
The tram network, as primarily represented by the Standards, Coronations & Cunarders (the last of which also represent the final evolution of full-size double-deck trams in this country). I suspect it's hard to imagine for a young Glaswegian of today that this city had any trams at all, let alone the size of the network at it's peak, given how little of it survives beyond a handful of preserved trams at the Riverside Museum.
And the original Glasgow Subway rolling stock. Hopelessly out of date by the late 50s and emblematic of the city's lack of investment by the mid-70s they may be in the eyes of some, but they had a character all their own and for many Glaswegians growing up in that time, the definitive iteration of the system.
I visited New York City in the early 2000's when the Ford crown Victoria was dominating both taxi and the police department. Now they're no longer in use and haven't been for quite some time I see due to age/ licensing and so on.
Before the Crown Vic, it was the Checker Marathon that filled the role of New York's taxi on the world stage. To me, the latter embodies New York even more than the Crown Vic did. Seeing a pic of one with the pre-September 2001 Lower Manhattan skyline as part of the backdrop certainly hits different now. Production ceased in 1982 and the last example was retired from NY service in July 1999.