To Dig or Not To Dig

The WAPO has a great graphic regarding the proposed tunnel that may or may not be dug under Tysons Corner for the Dulles Rail Project. Take a peek, here.

The page also has a list of various groups associated with the project and where they stand on the issue.

To see another map of the area, check this out.

I can't imagine the long-term maintenance costs on a tunnell are less than that of an elevated track but I could be wrong.

METRO historically has a very bloated maintenance budget and never seems to have enough money for maintenance so you would think that in the long run it would be wise to try and reduce those maintenance costs. That said build it above ground.