ELLEN M. BANNER / THE SEATTLE TIMES
Hector Mendez, a supervisor with Holland Co., welds sections of rail on the floor of Sound Transit's future Capitol Hill Station. Contractors are nearly finished welding two miles of tracks between Capitol Hill and downtown. Using a modern technique called "flash-butt" welding, the team heats steel rails to more than 1,800 degrees, so the ends fuse together. As they cool, rails are inserted into the tunnel using rollers. Another team will fasten tracks onto concrete bases along the tunnel floor. Link light-rail service will be extended in 2016 from Westlake Center to Husky Stadium.