Indeed. +darrenkopp missed the Mid-Jordan line, the West Valley line (both currently operational), the airport line (opening in April) and the Draper line (also opening in 2013). These are mostly east-west lines. Also not included is the Sugar House street car line.
SLC mayor Ralph Becker says, "by the end of 2013, we will have witnessed the largest expansion of an urban rail system in the nation." [1]
"70 miles in 7 years" seems pretty ambitious to me. [2]