I stained the ties I installed last month, and applied the ballast. On the right-hand side of the photo you can see where the ballasted area ends and the flextrack starts. That is just a few inches into the tunnel that is going to be installed there.
The same thing on the other side of the center section. On the back, lower level you can see where the ballasted area stops and the flextrack starts. Again another tunnel portal is going to be installed there.