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) Named after the Trinity River, which flows between Fort Worth and Dallas, the TRE was launched on December 30, 1996, shortly after the inaugural service of Dallas' light rail system, operating from Union Station to the South Irving Station in Irving.

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