Current reconstruction methods for older transit track systems are costly and require lengthy disruptions of service. Alternative methods of track reconstruction that allow work to be completed efficiently during off-peak periods or reduce the total time for reconstruction would improve service and yield economic benefits.

A number of methods for expediting track reconstruction by using precast concrete systems have been introduced in recent years. The use of precast concrete systems for track reconstruction can reduce construction time and minimize adverse impact on service while realizing economic and other benefits. However, research is needed to evaluate these systems and develop better procedures for track reconstruction. This research will focus on the installation and related design of precast concrete systems to replace existing track in tunnels. It will not deal with the removal of the existing track, but it will address any preparation needed prior to installation.

The objectives of this research are to identify and develop optimized precast concrete systems that allow efficient reconstruction of older tunnel track systems and to develop procedures for their installation.

Status: The contract with Louis Berger International, Inc. was terminated, and the scope of work was revised. See TCRP Project D-3A.