T Line (RTD)

T Line
Overview
Owner	Regional Transportation District
Locale	Denver metropolitan area
Termini	Alameda Lincoln
Stations	12
Service
Type	Light rail
System	RTD Rail
Operator	Regional Transportation District
Rolling stock	Siemens SD100 & SD160
History
Opened	June 7, 2026 (2026-06-07)
Technical
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrification	Overhead line, 750 V DC
Route map to Union Station Alameda I-25 I-25 & Broadway to Littleton–Mineral Louisiana–Pearl University of Denver Colorado Yale Southmoor Belleview Orchard Arapahoe at Village Center Dry Creek County Line SH 470 / E-470 Lincoln to RidgeGate Parkway

The T Line is a Regional Transportation District (RTD) light rail line that serves stations in Denver, Greenwood Village, Centennial, and Lone Tree, Colorado. The line began service on June 7, 2026, as a part of several service changes meant to accommodate a major rail construction project in downtown Denver. It is colored red on system maps.

The line was introduced as a result of the H Line being suspended due to RTD's Downtown Rail Reconstruction Project. RTD considers the service temporary (hence the "T" Line designation), and it is planned to be discontinued once H Line service is restored.

Route

The T Line's northern terminus is at Alameda station, in Denver's Baker neighborhood. It follows the C and E Lines south to I-25 & Broadway, where the C Line diverges. The E and T Lines depart the station on a flyover and parallel Interstate 25 to the southeast. The R Line joins at I-25's interchange with Interstate 225 in southeast Denver. The three lines travel together through Denver's southeast suburbs to the T Line's terminus at Lincoln station.

The T Line's entire route is shared with the E Line, and it is a supplemental service along the Southeast Corridor in order to replace service frequency lost by the suspension of the H Line.

History

RTD had previously altered light rail service in the summers of 2024 and 2025 in order to rebuild trackage in the Downtown Loop and on Colfax Avenue which dated from the opening of the light rail in 1994. During these first two phases of the project, referred to by the agency as the Downtown Rail Reconstruction Project, the D Line's northern terminus was re-routed to Union Station, the H Line was truncated to just serve stations in Aurora (with a connection to the E Line at Southmoor), and the L Line was suspended.

RTD implemented service changes to accommodate the third phase of the project on June 7, 2026. In this phase, the D, H, and L Lines were all suspended, and the C Line was temporarily re-instated along the Littleton-Union Station corridor (following the D Line's 2024/2025 detours and its former route prior to its elimination from service). In order to replace service frequency in south Denver lost by the suspension of the H Line, RTD introduced the T Line as a temporary service and R Line service was extended back to its former terminus at RidgeGate Parkway station.

RTD extended the T Line's northern terminus one stop north to Alameda station in September 2026. In addition, the temporary re-instatement of the C Line from June was made permanent, with the D Line discontinued. Unlike the C Line, the T Line will remain a temporary service pattern and is planned to be eliminated once the Downtown Rail Reconstruction Project is complete.

Stations

The T Line's entire route is shared with the E Line.

Station	Municipality	Opened	Major connections & notes
Alameda	Denver	October 8, 1994	Park and ride: 240 spaces
I-25 & Broadway			Park and ride: 988 spaces
Louisiana–Pearl		November 17, 2006
University of Denver			Park and ride: 540 spaces
Colorado			Park and ride: 363 spaces
Yale			Park and ride: 129 spaces
Southmoor			Park and ride: 788 spaces
Belleview			Park and ride: 59 spaces
Orchard	Greenwood Village		Park and ride: 48 spaces
Arapahoe at Village Center			Park and ride: 817 spaces
Dry Creek	Centennial		Park and ride: 235 spaces
County Line	Lone Tree		Park and ride: 388 spaces
Lincoln			Park and ride: 1,734 spaces