In answer to the OP's question.
Flew 4.5 hours London to Cairo, travel in budget as it allows us more travel for the cash we have available. 5 days later train from Cairo to Luxor, 11.5 hours along the Nile in 1st class for peanuts, but 2nd class on Egyptian 'express' trains isn't at all bad either looking at the seats and car layout.
Flight was ok, cramped seats, slightly uncomfortable seating not as good as Greyhound in any respect. Usual faff at both airports, retail always comes before passenger comfort and totally without any human contact. For me airports are a necessary evil that are designed for corporate benefit and not much else.
Railway stations on the other hand are magic places, whether small, lonely and basic or glamorous such as LA Union, Grand Central, St Pancras, Milano and Marseilles. Then there are the odd ones, they have a few in Moscow, Surf Beach, CA, Portland a throw-back to earlier times etc etc etc, to me railway stations connect with us humans in a way airports can never do.
Almost any of these plus many more put you in a good frame of mind to start your upcoming journey, or a good end point to the journey just travelled. Have never felt that about airports where individuals are far too insignificant.
Then there is the train. You are in a geographical and time capsule with real life and scenery passing by your window day and night, you live in 'train time'. Then there are always if you choose fellow passengers who you can interact with, it appears to me as though train passengers have a different social outlook to plane passengers. More open, more interested in what and who is around them, and of course more time.
There are occasions where time and sometimes cost constraints have the upper hand, then a flight it has to be, but Japan, China, and some of mainland Europe are now faster by train for some city centre to city centre journeys.
Our first of many to come Egyptian trains was no exception with people interacting, Egyptians with each other, with other Africans, and with us handful of Europeans (5) on a 15 car train that was always full. I thought it would be difficult to interact as I only have 2 words of Arabic, most Egyptians away from the heavily touristed areas do not speak or understand English, not even younger people.
But we found language wasn't a barrier, often it was replaced with big smiles and gestures, and un-asked for help, yet again the train came up to hoped for expectations.
I'm not denying that planes have their place in transport systems, we flew to Egypt, but when there is the opportunity to take a train a plane comes a long way second.
Of course, just a personal opinion.