High Quality Content by WIKIPEDIA articles! The Blue Line is a light rail line on the TRAX system in the Salt Lake Valley of Utah operated by the Utah Transit Authority (UTA). It is the first line of the TRAX system completed. The line opened on 4 December 1999, one year ahead of schedule after two years of construction. In addition to Salt Lake City, it also serves the communities of South Salt Lake, Murray, Midvale, and Sandy. The line was known as the North/South Line or the Sandy/Salt Lake Line until color names were adopted for each TRAX line in August 2011. An extension of the line to Draper is under construction and expected to be opened in August 2013.