Get a rare glimpse into places that are usually out of sight! The Underground Worlds series uses detailed cutaways and illustrated diagrams to show the layout and purpose of various underground structures and systems. Find out how they were designed and built, the challenges they presented in construction, and the innovative technologies that have made building underground possible. The Underground, the Metro, the Tube, the subway-whatever you call it, underground transit is a mark of a modern city public transportation system. Underground Transportation Systems uses cutaway illustrations and historic photographs to explore the construction of the world's great underground subway and train systems. Also included are underground roads, escape routes, and abandoned tunnel systems. Book jacket.