Where do subway and construction companies get those tunnel drilling machines? What does one cost? What sort of fuel does it use?
by 
HungryGuy
ANSWERS: 1
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Krupp and Herrenknecht are (at least in Europe/Germany) maker of this shield tunneling gear. Most certainly there are more in America and Japan. We are certainly talking tens of Millions of Euros a piece. And certainly they are powered by electricity. Dig the photos at Herrenknecht, this is cool gear: http://www.herrenknecht.de/en/dyn_frameset.php3?hauptnavi=dyn_hauptnavi.php3?h_nr=2&feinnavi=feinnavi_maschinen.php3&main=2_maschinen/html/2_maschinen.html
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