Mid-day service begins Sept. 12 on the south Sounder line, connecting Lakewood, Tacoma, Kent and other stations to Seattle.

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Sound Transit will launch its first mid-day commuter-train service Monday, Sept. 12, on the south Sounder line between Pierce County and Seattle.

A two-car train will leave Lakewood Station at 10:18 a.m., reaching King Street Station at 11:31 a.m., then depart King Street Station at 2:32 p.m., returning to Lakewood at 3:45 p.m. It will serve all stops, and with the number of railcars increasing the next year.

This is the second of four new round-trip trains funded by the Sound Transit 2 ballot measure of 2008. Track access and improvements for these four trains cost taxpayers $185 million in payments to BNSF Railway, which owns the passenger and freight corridor.

The south line carried an average 14,570 weekday passengers this spring on 20 train runs, or 10 round trips, plus gameday trains for sports fans. Two more peak-time trains will begin next year, and CEO Peter Rogoff hopes to eventually make a deal with BNSF to get track time for all-day passenger service.

“The new train will provide flex-schedule workers and other riders an additional travel option for bypassing highway gridlock that now snarls traffic throughout the day,” said spokeswoman Kimberly Reason.

A less-used north line between Everett and Seattle provides four weekday round-trips.