Mortal Engines by Philip Reeve:
Science Fiction Inventions, Technology and Ideas
Traction Cities lumber across the landscape on caterpillar tracks and huge wheels. Big cities hunt smaller cities, which in turn hunt towns which in turn hunt villages - tearing them apart for resources and fuel. Municipal Darwinism rules. Select
Traction City Gut
The area of a Traction City used for taking apart and consuming captured prey cities.
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