Another in the series of old projects. This time, Floaty-Robo-Ponies!
Like Muckity, this was another idea that had a whole world behind it; Vroom, a alternate timeline of Equestria in which Celestia steps down from her throne after banishing Nightmare Moon, feeling that she is unfit to rule. In order to keep the country stable until Celestia's return, an artificial alicorn called C67 (Seezix Zevenne) is installed to temporarily take her place.
1000 years later, Equestria is now, by far, the most technologically advanced civilization on the planet and every inch of the country's land serves some purpose toward its continued prosperity and security, all perfectly in place for when its true ruler comes back. Unfourtunately, Seezix Zevenne has long become viewed as the country's true ruler by her subjects, so who knows what will happen when Nightmare Moon returns to upset this carefully crafted and utterly efficient balance?
Also, Robo-Fluttershy looks like a duck when carrying critters across fast-moving rivers, because of course she would.
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Others in this series:
Vertium
Sparkfree and Blitz
Tatzldash
Muckity
Dead Mares Walking