On April 18, 2016, SEPTA launched PTC on the Warminster Line, the first line to use the system. Over the course of 2016 and into 2017, PTC was rolled out onto different Regional Rail lines. On May 1, 2017, the Paoli/Thorndale Line, Trenton Line, and Wilmington/Newark Line (all of which run on Amtrak tracks) received PTC, the last of the Regional Rail lines to receive the system. Metrolink, the Southern California commuter rail system involved in the 2008 Chatsworth train collision that provided the impetus for the Rail Safety Improvement Act of 2008, was the first passenger rail system to fully implement positive train control. In October 2010, Metrolink awarded a $120 million contract to PTG to design, procure, and install PTC. PTG designed a PTC system that used GPS technology informing position to on-board train computers, which communicate wirelessly with wayside signals and a central office. Metrolink anticipated placing PTC in revenue service by summer 2013. However, Parsons announced the FRA had authorized Metrolink to operate PTC RSD using Wabtec's I-ETMS in revenue service on the San Bernardino line in March 2015. Metrolink announced PTC had been installed on all owned right-of-way miles by June 2015, and was working to install the system on tracks shared with Amtrak, freight, and other passenger rail partners. In the 1990s, Union Pacific Railroad (UP) had a partnership project with General Electric to implement a similar system known as "Precision Train Control." This system would have involved moving block operation, which adjusts a "safe zone" around a train based on its speed and location. The similar abbreviations have sometimes caused confusion over the definition of the technology. GE later abandoned the Precision Train Control platform. In 2008, a team of Lockheed Martin, Wabtec, and Ansaldo STS USA Inc installed an ITCS subsystem on a 120-mile segment of UP track between Chicago and St. Louis. Other major software companies, such as PROKARMA, Tech Mahindra, are also some of the strategic IT partners in development of PTC systems. Through December 31, 2017, Union Pacific Installed 99 percent, or more than 17,000 miles, of total route miles with PTC signal hardware. Union Pacific has partially installed PTC hardware on about 98 percent of its 5,515 locomotives earmarked for the same technology and have equipped and commissioned 4,220 locomotives with PTC hardware and software.