Very possible. Not suggesting that Wool was entirely unique, but more specifically, that Snowpiercer seemed to have taken the entire idea of Wool and just shif

Very possible. Not suggesting that Wool was entirely unique, but more specifically, that Snowpiercer seemed to have taken the entire idea of Wool and just shifted the axis from vertical to horizontal. There were a LOT of copied ideas. Perhaps none of them were original to Wool, but Wool was not (to my knowledge) as much a clone of any individual work as it was the compilation of a lot of tropes.