The really telling contrast is the difference between 1961 and 1969. The former is not far off the 1930s, the latter almost where we are now (save for Bridport, Watercress line and a few losses, and some reinstatements such as Oxford - Bicester).
I picked up a number of others that are really sadly missed - makes me wonder if we had had that network left in place rather than further closures, we would have a far more appropriate network for the late 2020s.
The 1962 map is intriguing - were the dashed lines intended as possible closures (which I see seem to include Bristol - Exeter direct)?
Withdrawal of LOCAL services ... kept for long distance