Her half-waking mind went back to Sunset's theorizing about why Equestria was going through an Industrial Revolution at all, based on the vantage point she'd gained after living and going to school in a world nearly a century and a half ahead in engineering. "Technology scales up logarithmically," she'd lectured to pass the time as they stumbled through the Everfree. "Magic doesn't; it's purely arithmetic, as far as I can tell. A single pony with a crane can lift more, and do it more efficiently, than a whole crew of unicorns. One locomotive can pull a bigger train faster than a team, even magically strong earth ponies."