to offer public transit options during a construction project along Interstate 95 in Wilmington. Service on the Chestnut Hill West Line resumed on March 8, 2021, on a limited schedule, with service running Monday through Friday. Service on the Cynwyd Line resumed with limited operations on September 7, 2021. Weekend service on the Chestnut Hill West Line was restored on December 19, 2021. 2045 Philadelphia transit plan In February 2021, the city government of Philadelphia announced the Philadelphia Transit Plan, which outlines the city's proposals for its public transportation system through 2045. For Regional Rail, the plan included increased service frequency, a fare system overhaul, and the creation of many metro-like Regional Rail lines within the Philadelphia city limits and close suburbs. Regional Rail would be split into the Silver Line, frequent Regional Rail (metro-style lines), and Regional Express Service (lines similar to the current Regional Rail, which would make fewer stops closer to Philadelphia). This plan would require upgraded tracks and stations, new vehicles, and infrastructure replacement and upgrades. Similar to other major infrastructure upgrades to existing commuter networks such as GO Transit Regional Express Rail in Toronto or the Electrification of Caltrain in San Francisco. The plan also proposed extensions of Regional Rail services to Phoenixville, Quakertown, and West Chester. The 2045 Transit Plan breaks this into 3 phases. Phase 1: "The Silver Line" Phase 1 entails the creation of the "Silver Line". The name comes from the Silverliner family of EMUs which are used in Regional Rail service, and was chosen to denote the metro-like similarities between the Silver Line and the Blue (Market–Frankford) and Orange (Broad Street) lines. The Silver Line would run from Fern Rock Transportation Center in North Philadelphia to Penn Medicine station in University City. It would have the same frequency as a bus line, with 15-minute headway for 15 hours a day every week. Fares along the Silver Line would be similar to SEPTA's other transportation modes, including bus, trolley, and subway. Phase 2: Upgrade priority lines Phase 2 would include the addition of more metro-like regional rail routes. These would be called Frequent Regional Rail lines and would be similar to the Silver Line, having lower fares, free transfers, and increased frequencies. Currently, there are four phase 2 routes proposed, including conversion of the Manayunk/Norristown, Chestnut Hill East, and Airport lines to Frequent Regional Rail, and a portion of the SEPTA