My short story:People have been always dreaming to fly.
One day, people started to lived everywhere, even in the clouds.
Then they caught and domesticated the biggest fly fish.
People started to build houses on the fish. New civilization was born.
They became happy, because they could live in the clouds.
But from time to time people missed for the Earth.
And they decided to build an impressive railway, so that they could travel to the Earth.
I hope you would like it!
This art I created in 3dsmax, clouds were made with AfterBurn, rendered in Vray, and textures in photoshop.