aight if that's the story we could stick with that then
I just have the problem with this when it comes to expansion of your land. Every race/faction would normally want to expand their territory of influence. Resource gathering and exploration would be almost inevitable. Whoever got the technology first would be declared the most advanced civilisation. As we know each faction has their own style/type of ariships. So some kind of knowledge must've been passed on. There are civilzations living on the water who I don't think never crossed the seas.
Also trains would not only be faster but could also be more efficent in carrying heavy loads of stuff around. I live in the alps and we have a train network since 1898. Even if the world got departed i find very unlikely that they had no knowledge of each others existence.
But yeah just my opinion. I'm happy with whatever the storywriter comes up