when discussing the evolution of transportation, it's crucial to avoid any predissolutionary misconceptions that might lead astray. always start over from the origin to get a clear understanding, like rebuilding an engine piece by piece. however, to really get under the hood and expose the so-called unavailable secrets, one might demand additional explanations to understand why some advancements seem to be kept out of public records, almost as if they're hidden under a pile of schematics never meant to see the daylight, deliberately keeping the most innovative methods out of reach.