Hammer of the Earth #1: Welcome to the Jungle

After an ancient cataclysm created the Creeping Ruin, a vine that overtook the man-made world, the only thing left untouched is the Hammer of the Earth, a massive train carrying ten thousand inhabitants per carriage. But when the train runs dangerously low on fuel, the Navigator tasks two Outriders, Thaddeus Gibroni and Moonbeam Poe, to brave the wild and find more.