Regional Transportation District service changes taking effect June 7 will reinstate the C Line, introduce a temporary T Line and boost frequencies on several rail lines to maintain connections during the next phase of the Downtown Rail Reconstruction Project, according to a news release.

The adjustments include suspending the D, H and L lines while adding new and enhanced service options across the rail network and on 12 bus routes.

RTD officials said the changes will introduce a temporary T Line along the Southeast Corridor from Lincoln Station to I-25-Broadway Station. The T Line will run every 15 minutes on weekdays from 6 a.m. to 6 p.m., every 30 minutes between 6 p.m. and midnight Sundays through Thursdays, and until 2 a.m. on Saturdays.

The C Line will return temporarily to replace D Line service between Denver Union Station and Littleton-Mineral Station. The R Line will extend south from Lincoln Station to RidgeGate Parkway Station, adding stops at Sky Ridge, Lone Tree and RidgeGate Parkway, with frequencies increased to every 15 minutes during peak periods.

G Line trains will return to 15-minute frequencies on weekdays from 6 a.m. to 9 p.m. and on weekends and holidays from 8 a.m. to 6 p.m. B Line service will improve to every 30 minutes during weekday peak periods.

E and W lines will receive schedule adjustments to improve connections and on-time performance.

Twelve bus routes will see service improvements funded by a $9.25 million Clean Transit Enterprise grant, according to the release. Enhancements include more frequent midday service on routes 0L and 43, the 16th Street FreeRide every 3 minutes instead of every 4.5 minutes, and earlier weekend arrivals plus added trips on route 104L. Many other routes will receive schedule updates. Keep track of updates at RTD’s Service Changes webpage.

The changes are part of RTD’s regular three-times-per-year schedule adjustments, which evaluate ridership, traffic patterns, economic conditions and customer feedback. The agency said ongoing system assessments help maximize resources and reliability.

Customers using Access-a-Ride should note that bus and rail modifications may affect paratransit availability. RTD said it remains committed to accessible service.

RTD encouraged riders to use the Next Ride app or visit the agency’s Service Changes webpage to plan trips. Customers can sign up for Service Alerts or call Customer Care at (303) 299-6000 for information. More details are available at rtd-denver.com.

The Downtown Rail Reconstruction Project is a multi-year effort to rebuild aging infrastructure in downtown Denver. Major phases are scheduled to wrap up in early 2027.