The Trinity Railway Express (TRE) is a commuter rail service in the Dallas–Fort Worth metroplex, Texas, United States.

It was established by an interlocal agreement between Dallas Area Rapid Transit (DART) and Trinity Metro.

[5] It runs along a former Chicago, Rock Island & Pacific Railroad line that the cities of Dallas and Fort Worth purchased in 1983 for $34 million.

[6][7] On September 18, 2000, the line was extended to the suburb of Richland Hills[6] and, for the first time, there was rail service available between downtown Dallas and Dallas/Fort Worth International Airport.

The train continues west to the Dallas County/Tarrant County border, passing under the President George Bush Turnpike.

While crossing into Tarrant County, the line passes about four miles south of Dallas/Fort Worth International Airport.

The line passes over SH-360 and takes a slight southwest turn along the northern city limits of Arlington.

As it approaches Interstate 820, it takes a sharper southwest turn towards downtown Fort Worth, passing through Richland Hills and Haltom City.

According to current TRE schedules, a one-way trip in either direction takes approximately 1 hour and 2 minutes.

[10] TRE does not provide service on Sundays except during the State Fair of Texas, in which case a Saturday schedule is used.

These were overhauled in late 2010 by the Norfolk Southern Railway and RELCO Locomotive to meet EPA standards and renumbered 120–126.

[17] AllEarth subsequently resold two of the TRE cars to TriMet, of Portland, Oregon,[18] before they had left Texas, and those two Dallas RDCs (Nos.

2007 and 2011) were moved in August 2017 from Texas to Oregon, where TriMet planned to use them on its WES Commuter Rail service.