380-ton span marks milestone for Dulles Rail project

TYSONS CORNER - Slowly, deliberately and delicately, the final 380 ton aerial piece of the Silver Line puzzle fit into place Tuesday. It's a major milestone for the Dulles Rail project.

The span, made up of 12 custom-cast concrete segments, completes the aerial guideway that will carry Metro subway trains on the line. It marks the first time that a complete connection of the first phase of the Silver Line has been made from Falls Church, through Tysons and continuing to Reston.