Navarra's review of innovative rail systems is valuable as far as it goes. His, brief text, interspersed with photos and artist's renderings, surveys present and projected rail lines and urban mass transit in Europe, Japan and America. The clipped, rather sterile presentation doesn't take time to explain such technological features as gas turbines and linear induction motors; nor does the description of, say, the gleaming Japanese Shinkansen begin to capture the ambience of crowded cars and station stops only seconds long. However Navarra does introduce planning concepts such as ""balanced transportation,"" and specifics on such projects as the French aerotrains and Morgantown, West Virginia's experiment with Personal Rapid Transit are much harder to find than comparable material on Supercars (1975).