Francis Graham 
Gravity Trains: 
And Other Speculations on 24Th Century Technology

Imagine a straight line tunnel right through the Earth connecting two cities, and a train falling through it. This is a Gravity train, and it has been a frequent example in physics books for more than a century. But could such a system actually be built? What new technological breakthroughs would be required? How has tunnel technology evolved during the industrial age so far? Francis Graham (Kent State University) examines this and the prospects of the future high technology required for it in this book, which takes an optimistic look at the future development of human society.

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Francis Graham is emeritus faculty of the Department of Physics at Kent State University . He has been interested in the progression of technology in society , the exploration and resource exploitation of the Earth’s Moon and also new aviation technologies. He is one of the original founders of the Tripoli Rocketry Association, the largest amateur and high power rocketry organization in the world. He has written numerous articles and papers for scientific journals and popular media, and also a textbook on physics. He presently lives near Pittsburgh.