the line from the Federal Center to the Jefferson County Government Center would be reduced to a single track to help cut costs. According to RTD, this change would reduce train headways from 15 minutes to 5 and make it easier for the line to run along the side of U.S. 6. Upon the completion of construction the line was designated the "W Line". The 12.1 mile light rail line was opened to the public on April 26, 2013, and is the first completed segment of the FasTracks regional transit-expansion plan. US 36 Corridor This is an long express bus line, branded "Flatiron Flyer", running along US 36 between Denver and Boulder, Colorado with six stops planned along the route. A joint project between CDOT and RTD, the road was widened by 40 feet in each direction to allow the addition of a high-occupancy vehicle lane instead of the trains voters approved. The project was completed in two phases, with the first phase completed in May 2010. The second phase began construction in July 2012 and opened to the public in 2016. Sections of the road subsequently collapsed in summer 2019. Extensions (light rail) There are plans for extensions to a few existing light rail lines; they include a 2.5-mile (4.0 km) extension to the Southwest Corridor, extending the line to the southwest corner of Lucent Boulevard and C-470. A 2.3-mile (3.7 km) extension to the Southeast Corridor into Lone Tree which opened to the public in May 2019; and a 0.8-mile (1.3 km) extension to the Central Corridor to connect the 30th & Downing station with the East Corridor commuter rail line at the intersection of 38th and Blake. Economic growth/development According to RTD (2012), when new development occurs near stations, it increases the likelihood that residents and workers will choose transit as their transportation mode. This reduces the growth in vehicle miles traveled (VMT) and auto trips on a constrained roadway system while, at the same time, accommodating new growth. RTD has conducted a Quality of Life (QoL) study for the neighborhoods’ impacted by FasTracks with baseline data collection starting in 2006 and continuing bi-annually to the present. The QoL study tracks a number of economic and community development indicators. Rolling stock As of 2015, FasTracks has on order 66 Hyundai Rotem Silverliner V electric multiple unit rail cars operated in a married pair configuration. These cars were