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 in order 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 the aforementioned rail construction 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 system 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, following the former route of the C Line while retaining the D Line designation. The H Line was truncated to only serve stations in Aurora, with a connection to Denver via the E Line at Southmoor. The L Line was suspended, as all of the stations along its route were affected by the rail reconstruction project.
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. 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. StationMunicipalityOpenedConnections & notesDenverOctober 8, 1994 3, 4, 52, ART 0, 0L, 11, 14Park and ride: 988 spacesNovember 17, 2006 11, 12 24Park and ride: 540 spaces 21, 40, 46Park and ride: 363 spaces 46Park and ride: 129 spaces 35, 40, 46, 65, 105Park and ride: 788 spaces 73Park and ride: 59 spacesGreenwood Village Park and ride: 48 spaces 66, 153, 169, AT, ATAPark and ride: 817 spacesCentennial Park and ride: 235 spacesLone Tree 402LPark and ride: 388 spaces 483Park and ride: 1,734 spaces References