Trope A Day-Space Elevator

Space Elevator-Before the development of anti-gravity technology, ponies built two of these, the griffins built one, and you can tell the early colonies that happened before anti-gravity technology.  One of the big things about the Princess Platinum-class Orbital Foundry Ships was that it had a weaving loom to build orbital elevator cables.   The space that the loom used to take up is now filled with fabricators and smelters.