The train had nearly crested a hill, and she could feel their motion begin to slow as they neared the top. James searched, and found a towering archway set up around either side of the tracks not far ahead, glittering in the weak northern sunlight. It looked to be made of colored glass, or perhaps an enormous quartz crystal, like those in underground caves in Mexico, with geodes gigantic enough for people to climb. Impressive for such an apparently primitive society to cut without shattering, but nothing that incredible.