You don't need any navy or bombers to stop invasions. You don't need rails, but they do help. You need CxxC spacing, a knowledge of the AI tactics. I have played many AW games where the AI had big numbers advantage and they were stopped.
You mean pulling the AI's strings and bouncing them between empty cities?
The only times the AI has success is in some Sid games, where several nations are not too far away and all are at war with me. Then I am often not able to fend them off in the early game.
So what I am saying is what you say is valid for many players, but is not inherent to the game, only to the skill levels of the players.
Your skill and knowledge is certainly a great help as is evidenced in the invaluable advice you gave to me, but I don't see how this has any bearing to the discussion given the topic of the thread.
Secondly, I don't understand the need to grind in the fact that you're a better player than most of us to make a point about how to stop an AI invasion, which admittedly is not hard to do. What is hard for you at sid, may be just as hard to darski on a different level. difficulty is relative.
Civ is a game of variant play, even in epic games. I think we can allow that. What's hard/fun to you may not be hard/fun to others. Berating people for playing an epic game to the modern era when it should have been won well before that is really not a good way to start a conversation.
I'm just curious why you would post this. Do you think people's opinions are irrelevant unless they are as skilled as you? Because I certainly do want your advice in my future games so I don't mean to start any enmity between us over such an inconsequential point.