On film, it occasionally manifests itself in period pieces that focus on the encroachment and proliferation of the railroad: its engines (as in King Vidor's Duel in the Sun and Beyond the Forest, or the Hughes Brothers' From Hell ) the manifestation of the industrial revolution in terms of hellmouths and serpents--William Blake's "Tyger" burning bright in the forests of a primordial night, all-consuming and inexorable.