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Later this month, Sound Transit and BNSF Railway Co. expect to complete track and signal improvements between Seattle and Tacoma, Wash.

Launched in 2000, the $350 million project included upgrades to nearly every crossing along the 40-mile corridor, as well as the addition of nine high-speed crossovers, which will enable Sounder commuter-rail trains to pass freight trains. In addition, the railroads replaced the signal system with a Centralized Traffic Control system.

The improvements will reduce train delays and enable Sound Transit to add two daily trains between Seattle and Tacoma to meet growing ridership demand.