station at Pearson began in the spring of 2012, at a cost of $128.6million. As of 2010, the entire project was expected to cost $456million. Undertaken as part of the Georgetown South Project, the work consisted of five new road overpasses and two road underpasses, one railway grade separation, one bridge reconstruction and the widening of 15 other bridges, construction/re-construction of four stations, major track and grading construction, signal installations utility relocations, as well as the new elevated spur to and from the airport. This work was conducted while minimizing disruption to existing train operations, local residents and businesses. A new rail tunnel under Highway 401 was still required at a later date to meet future ridership demands. Construction of tunnels for two tracks began in July 2019 and is expected to be completed in late 2021. Initial operation Service began on 6 June 2015, operated by the Union Pearson Express division of Metrolinx. With an adult one-way fare of $27.50 cash or $19.00 with a Presto card, the service was criticized for being the most expensive airport rail link service in North America; the fare was later reduced. During the 2016 Family Day weekend, the Union Pearson Express offered free rides to everyone. It resulted in lineups approximately two hours long at both ends of the line as more than 28,000 passengers took advantage of the opportunity. Fare reduction A new fare structure was introduced on 9 March 2016, which reduced the one-way ticket price between Union and Pearson from $27.50 to $12.00 cash, and from $19.00 to $9.00 with a Presto card. The change also introduced GO pricing between Bloor/Weston and Union stations. President Kathy Haley stepped down on 31 March 2016, and Metrolinx announced that it was conducting an organizational review. In 2017, the Discounted Double Fare program was introduced, which offered UP Express and GO Transit customers a discount of $1.50 when transferring to or from the TTC (equal to a 50 percent reduction of the $3.00 TTC cash fare at the time). The arrangement ended in March 2020 when the Government of Ontario terminated funding for the program. On 20 April 2019, monthly capping of fares was silently discontinued, resulting in an effective fare increase of 10 to 15 per cent for regular commuters, while single fares did not change. Metrolinx continues to offer a monthly pass for airport employees. Service Union Pearson Express operates