I stumbled across this fistful of fun -- someone had taken shots showing the changing design of high-density commuter/suburban/secondary trains over the years, starting with this wood veneer paradise in a Class 104:
That was a type of diesel multiple unit mainly used around the North-West and Tyneside, constructed in 1957, whereas this was a Class 302 a 25kv "overhead line" AC electric multiple unit, used mostly on the London-Tilbury-Southend line, built from 1958 onwards:
That design of fabric is, I seem to recall, known as "Trojan", and it was near-ubiquitous for a few years.
The next generation of multiple units was derived from a prototype known as PEP, and the Class 313s were constructed from 1976 onwards. Notice how the warm incandescent lighting has been replaced with fluorescent tubes:
The 508s were in the same family (although 3rd rail rather than overhead electrics), manufactured from 1979 onwards. They had the same low-backed seating, but the lighting power was doubled giving a harsh glare to the interiors:
Alas, that harsh lighting was here to stay (apparently there is a minuscule number of people who can barely see unless everything is floodlit, and the rest of us have to sit in starkly lit conditions just in case one of them happens to be somewhere on the train. The fact that a much higher proportion of us is light sensitive seems to be irrelevant to the Health & Safety Czars).
Anyway, the green check fabric from the previous train can also be seen in our last multiple unit, the spectacularly ugly Class 455, another 3rd rail job, under the floodlighting:
I was rather taken with those photos, too, actually: the way they are mostly out of focus but that just adds to a dreamy sense of hyper-reality (does that make any sense at all?).
Not much else to add, really.