The Mid-Corridor section of the Expo Line has seen the building and opening of our construction field office at the corner of Exposition Blvd and Arlington Ave. The field office houses construction vehicles, materials and offices for Expo and the design and build contractor, (FFP). Construction activities in the Mid-Corridor include soil excavation, removal of pre-existing rail from the Expo right-of-way and the placement of K-rail along the right-of-way.