The Caltrain Modernization Program (CalMod) is a $1.9 billion project that will electrify the railroad's main line, which serves cities in the San Francisco Peninsula and Silicon Valley. Caltrain service has existed almost unchanged in its current form since it was operated as the Peninsula Commute by the Southern Pacific Railroad in the late 19th century, but proposals for electrifying the line began as early as 1992. The project lay dormant due to lack of funding until Caltrain agreed to share its tracks with the California High-Speed Rail Authority. CalMod will electrify of tracks between 4th and King station and Tamien Station and plans to be completed by 2021. New electrical infrastructure includes installation of approximately of 25 kV 60 Hz single-phase AC overhead contact lines and ten new power stations (two traction power stations, a switching station approximately halfway along the line, and seven paralleling stations).