[Kiashu:] fossil fuels are not going to just STOP. They'll become more scarce. So there'll still be some transport around.

I think this is a crucial assumption here, which I find highly contentious. I think there IS a very high likelihood that fossil fuels are very likely to indeed, as near as matters, just stop (come to an end within months/years, in the next few years.

What you overlook is that getting coal and oil is now becoming dauntingly complex. Alaska, drilling under kms of salt, etc. From my window I see Brindley's canal which lowered the price of coal by a factor of 2 the day it opened, and Telford's canal that improved on it 60 years later. But there's no more coal at the other end of those canals now!

Getting that oil and coal now depends on far more than a canal, it depends on a vast globalised industrial-commercial-financial-governmental-socialconfidence complex which no-one fully understands but is clearly vulnerable to collapse due to excessive complexity. Even a failure of credit could kill it dead.

Given that there is so little discussion of this vulnerability, and that societies and institutions are consistently abysmal at managing contraction, the odds look overwhelmingly strong that there is going to be an early collapse of the food supply to cities and from then onwards the whole great show falls apart and the hi-tech energy supply system dies with it (its already creaking at the joints as Simmons keeps pointing out).

Sorry, no shortage of coal here, which is really a big worry.

I agree there isn't a shortage of coal all round. The point is that there is now a total absence of coal easily transportable by canal etc to Birmingham. (And there are still hardly any trees in "Ladywood".) The world's remaining coal is generally lower-grade, far underground, far from where you want it. When people are struggling to merely feed themselves, they won't have time/energy for hiking many miles then digging deep down mines to extract black stuff that they don't have equipment ready to use it in anyway. The lack of affordable oil (and electricity) makes the exploitation of coal vastly harder, especially now the easy coal supplies are gone.
I appreciate the worry about CC but a system collapse would quickly "solve" that worry, like a knife in the chest would cure a headache.