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This shows the tunnel as it is descending to go under
the Burlington Northern tracks at the south end. The rail tracks seen here
are to carry cars for the removal of dirt as they excavated. Tracks for
commuter trains weren't decided on until later in the project.
It was a highly debated subject whether or not to put
rail into the tunnel, and finally it was decided that they would.
Ironically, the transit agency that evolved to run the rail service
decided to use a different size track, and so the tunnel will be closed
for about 3 years -- the same amount of time it took to build the tunnel
-- while they install new track.
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