The 72km line parallels the existing Union Pacific freight line south of the city into Utah County, with six new stations. With a maximum line speed of 127km/h, Utah Transit Authority (UTA) plans to offer a journey time of around an hour.
FrontRunner South is due to open on December 10, and is expected to carry 8000 passengers per day by 2015.
The project is part of UTA's Front Lines 2015 programme, which will add 112km to Salt Lake City's 102km commuter rail and light rail network by 2015.
