Dallas is the third-largest city in the state of Texas and the ninth-largest in the United States.

The city, with a population of over 1.2 million, is the main economic center of the 12-county Dallas–Fort Worth–Arlington metropolitan area which contains 6.1 million people, and is the fourth-largest metropolitan area in the United States and the largest in Texas.

Dallas is listed as a gamma world city by the Loughborough University Globalization and World Cities Study Group & Network.

Founded in 1841 and formally incorporated as a city on February 1856, the city's economy is primarily based on banking, commerce, telecommunications, computer technology, energy, and transportation. Dallas is the core of the largest inland metropolitan area in the United States that lacks any navigable link to the sea. The city's prominence despite this comes from its historical importance as a center for the oil and cotton industries, its position along numerous railroad lines, a strong industrial and financial sector, and its status as a major inland port (due largely to the presence of Dallas-Fort Worth International Airport, one of the largest and busiest in the world).

Dallas - Metro System

The A-train is a 21 miles (34 km) commuter rail line in Denton County, Texas, United States that parallels Interstate 35E and acts as an extension with the Dallas Area Rapid Transit Green Line at Trinity Mills Station in Carrollton. It is operated by the Denton County Transportation Authority (DCTA) and serves Denton County. It opened June 20, 2011.

A formal Alternatives Analysis study conducted in 2004-2005, which included extensive community and citizen involvement, identified the proposed rail line as the best and most cost-effective mobility solution for Denton County and the region. It cited the impacts of projected population growth, growing safety, traffic congestion and air quality concerns, as well as the need to improve access to Denton County’s vital health care facilities and three major college and university campuses.

In May 2005, the DCTA Board of Directors approved the study’s recommendation to construct the rail alignment on east side of I-35E using an existing railroad corridor. DCTA is working closely with the Federal Transit Administration (FTA) to accommodate all necessary Federal and local regulatory requirements. In March 2008, the DCTA Board of Directors approved the Final Environmental Impact Determination which details proposed measures to mitigate the environmental impacts of the rail project. In August 2008, the Regional Transportation Council approved funding of this project. Because of this, federal funds were not used in the construction of the train.

On 4 April 2011, the DCTA began tests of railcars, communications systems and signals on track between Carrollton and Lewisville Lake, with tests on the remainder of the route projected to begin later in the month, though this date was later pushed back to mid-May.

The train was opened on 20 June 2011 with celebrations at five train stations.

Trinity Railway Express

The Trinity Railway Express (or TRE) is a commuter rail line in the Dallas – Fort Worth Metroplex. It was established by an interlocal agreement between Dallas Area Rapid Transit (DART) and the Fort Worth Transportation Authority (The T). Each transit authority owns a 50% stake in the joint rail project and contractor Herzog Transit Services operates the line. The TRE began operating in December, 1996.

The TRE commuter line has a daily ridership of 9,800 and is the fourteenth most-ridden commuter rail system in the country. Annual ridership on the TRE exceeds two and a half million persons.

Until 2006, it was typically shown as a green line on DART maps and therefore was sometimes referred to as the "Green Line," but this was not an official designation. In 2014, DART chose green as the color for its new light rail route, the Green Line. Thus, the TRE is now shown as a dark blue line on DART maps.

Granbury, Texas-based firm 4G Metro offers Wi-Fi Internet access to TRE customers. The access point broadcasts as "4G-TRE" and is open.

Luciano Mende

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