The following are events related to rail transportation in the United States that happened in 2012. March 25 March – The North Shore Connector extension of the Pittsburgh Light Rail system opens extending the system 2 stops north. April 23 April – Boston's MBTA Commuter Rail Providence/Stoughton Line extension to Wickford Junction station opens. 28 April – The first phase of Los Angeles County Metropolitan Transportation Authority Expo Line opens for service. The line runs from downtown LA to Culver City with 8 new stations. The next phase of the project will extend the line to Santa Monica.
30 April – Oakton–Skokie station station on the Chicago Transit Authority's Yellow Line opens. June 15 June – The SacRT light rail Green Line Phase 1 to River District opens with 1 new stop. A future extension is planned to extend this line to the Sacramento International Airport but is not expected to be completed until sometime during the 2020s. July 28 July – Construction was completed and service commencing on the AirportLink line (now called the Orange Line) of the Miami Metrorail, extending service 1 stop southwest to Miami International Airport via the Miami Intermodal Center 30 July – The DART Orange Line is extended 3 stops west from Bachman station to Irving Convention Center station. September 22 September – The 2001-opened Portland Streetcar system, in Portland, Oregon, inaugurates service on a second line, the "Central Loop" (or CL Line), serving the central east side. This line is now known as the A and B Loop. October 8 October – Seattle's Sounder commuter rail south line extension 2 stops south to South Tacoma and Lakewood opens. December 3 December – Dallas Area Rapid Transit opens extensions on two lines: the Orange Line carrying passengers 2 stops west to , and the Blue Line extension 1 stop east to the Downtown Rowlett station. 10 December– Utah Transit Authority's FrontRunner extends service south 7 stations from Salt Lake City to Provo. At the same time, North Temple opens as an infill station.
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