This is a computer-based graph that shows the progress of any train in either of the two tunnels in space and time. The train's time of departure is on the X axis, and its place in the tunnel--designated by a code--is on the Y axis.
CNET Road Trip 2011
June 30, 2011 4:00 AM PDT
Photo by: Daniel Terdiman/CNET
| Caption by: Daniel Terdiman
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