Pierce County Executive Pat McCarthy and Tacoma Mayor Marilyn Strickland greeted Link light rail riders at Union Station Thursday with free treats from Hello, Cupcake in downtown Tacoma. Sound Transit is celebrating the 10th anniversary of Tacoma’s Link light rail system with a sweepstakes that includes a grand prize “Tacoma Getaway” package. According to Sound Transit officials, more than nine million riders have used the 1.6-mile light rail line over the past decade, and 3,600 people ride Link light rail on an average workday.