The Project is comprised of design, installation and testing of new fiber optic resiliency systems on the New Hampshire Main Line, Fitchburg Main Line, and Wildcat commuter rail lines (approximately 80 route miles of active railroad). The new fiber optic system will incorporate one 96-strand cable on each line for MBTA's exclusive use for vital systems, with an option for one 288-strand cable on each line for MBTA to lease to commercial entities in the future.

To support the fiber cables, a total of three (3) 1.5" innerducts will be plowed along the right-of-way for MBTA's exclusive use, with an option for three (3) 2.0" innerducts for commercial use. Where plowing is not possible, such as at grade crossings, bridges, other locations with existing MBTA or third party infrastructure, or where there are obstructions, duct or conduit will be installed by hand digging, directional boring, or direct installation as applicable.

MBTA vital systems fiber will be extended to existing MBTA signal bungalows. Commercial fiber will be extended and coiled to access points at passenger stations and elsewhere as identified during preliminary engineering. Handholes and manholes will be provided as necessary.