Tuesday, September 26, 2006
A little trivia
During the Big Dig, two tunnel boring machines (TBM) helped to dig out the tunnel that would eventually become I-93. They started on each end with the goal to meet in the middle, much like this fine event. I learned tonight from a well-placed source that the machines dug to within 100 feet of each other. Hand tools were then used to finish the tunnel. But the machines then both made right turns into the sides of the tunnel and were buried there.
So I'm not sure what the cost of one of those machines is, but I'm guessing $20 million maybe? And all because they didn't have a reverse gear. Much like this expensive toy currently.