I just came across this, and it sort of fits here as another bit of vicarious nostalgia, perhaps. My mum kept a few pages from some of her old school (Northgate School for Girls) magazines, mainly ones with 'news of "old girls"'. This is the ending of a contribution from 1934, which explains itself:
"There is one disadvantage of Edinburgh however, a student from Ipswich need not expect many week-ends at home during term, since the train journey takes between ten and eleven hours.
Roll on an efficient and inexpensive air transport service!"
Well, as it happens the time by train is now (says Journey Planner) under six hours, if you pick one with good connections at Peterborough (and perhaps York). Flying might be a bit quicker, but not a lot on this route.
Things have indeed moved on in 86 years. In my youth, there was even a through train (overnight) from Glasgow to Colchester, which would have offered Doris or Mildred direct travel from Edinburgh to Ipswich, though whether that was a relic of history or a transient service, I do not know. And "today" - though not sure about this year - direct flights from both Stansted and Norwich to Edinburgh.
There is no doubt that in spite of the acceleration of trains, many very long distance journeys with a significant cross country element have lost out for the traveller who ranks "fast journey" high up the list lost to air. Be than Ipswich to Inverkip, Exeter to Edinburgh or Dunmow to Dublin. Where the acceleration has brought a massive shift and a huge (precovid) market is on intermediate distance traffic - which is perhaps why the long-distance infrequent hardly-stopping pattern has been replaced by hourly trains still covering the same long distances, but now with anything from a handful to a dozen intermediate calls at each of which there is a substantial passenger turnover. The replacement of a kettle on the front by an electric moron under the carriages (whether powered from an overhead cable or a diesel engine also under the carriage), and of doors that can be centrally closed, has shortened station stops and replaced the palaver of getting the train moving again with a routine operation.