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Silver Line (DART)

The Silver Line, also known as the Cotton Belt Rail Line, is a 26-mile (42 km) hybrid rail (light rail with some features similar to commuter rail) service traversing Tarrant, Dallas, and Collin counties and in the U.S. state of Texas operated by Dallas Area Rapid Transit (DART). The line provides service from Dallas's northern suburbs of Plano, Richardson, Addison, and Carrollton to Dallas/Fort Worth International Airport Terminal B.

According to DART, the Silver Line is "designed to provide a high-speed, reliable transit option for residents and commuters with connections to the existing and planned transit systems" and aims to improve transit travel times by providing an alternative to congested roadway networks.

The working name for the project, the Cotton Belt Rail Line, comes from a former subsidiary of the Southern Pacific Railroad, the St. Louis Southwestern Railway, commonly known as the Cotton Belt, which previously owned the line. DART purchased the right-of-way in 1990 for future transit use.

Cotton Belt service along the line has been in planning since the original 1983 DART Service Plan. DART previously bought the right-of-way to the 52-mile (84 km) Cotton Belt corridor train tracks in 1990 and freight trains had since ceased use of the tracks. The line was also included in DART's 2030 Transit System Plan. However, in 2010 DART scrapped much of their 2030 plan, citing deficits and drops in revenue. A proposal to use private funding to construct both the Dallas County and Tarrant County segments was considered, but this plan was abandoned after the Texas Legislature failed to enact legislation necessary to the plan during the 2013 state legislative session.

DART officials stated that without private funding options, the agency would not be able to build out the line until at least the mid-2030s. DART considered the possibility of using bus rapid transit as a less costly alternative for current funding.

DART announced in late August 2016 that the project could be fast tracked and completed by as early as 2022, after DART secured funds needed to complete the project.

In late August 2018, the DART board voted to accept a plan which eliminated two previously-proposed stations, reducing the number of planned stations to 10.

On February 12, 2019, the DART board approved construction of a second track along the entire length of the line, which is anticipated to reduce wait times between commuter trains, avert delays during construction and maintenance, and better accommodate freight trains using the line. This design change is projected to cost $109 million, raising the design-build contract to its maximum allowable price of $923 million.

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