• Length (miles): 2.3
  • Vehicle Type: Light Rail
  • Stations: 3
  • Parking: 1,300 new spaces
  • Frequency of Service: 5 min (peak) / 6 min (off-peak)

At a Glance

  • The E, F, and R Line Extension (also known as the Southeast Rail Extension) is part of RTD’s 2004 voter-approved FasTracks plan to expand transit across the Denver metro region.
  • The extension expands the E, F, and R lines 2.3 miles from Lincoln Station to RidgeGate Parkway in Lone Tree.
  • The expansion encompasses three new stations: a Kiss-n-Ride at Sky Ridge Avenue near Sky Ridge Medical Center, one at the future Lone Tree City Center, and a 1,300 space Park-n-Ride at RidgeGate Parkway.
  • The extension includes a 5-span, 620 foot-long bridge over Lincoln Avenue; an 11-span, 1,397 foot-long bridge over I-25, and a 4-span, 506 foot-long bridge over RidgeGate Parkway.

Project Overview

  • 2008: RTD FasTracks conducted an environmental evaluation (EE) to determine ideal alignment, station locations, potential environmental impacts, and a companion mitigation plan.
  • 2010: Final EE and 30 percent of basic engineering completed.
  • 2011: Project team began an environmental assessment (EA) based on the EE to pursue federal funding.
  • 2012: Team begins New Starts application process. RTD engineering begins work on advanced basic engineering and coordination of the project scope with stakeholders.
  • 2013: Project accepted into the FTA's New Starts grant development phase and RTD FasTracks will submit additional information for further review over the next two to three years.
  • 2014: The FTA signed the Finding of No Significant Impact, which concludes the EA undertaken to fulfill the requirements of the National Environmental Policy Act, an eligibility requirement for federal funding.
  • 2015: RTD selected Balfour Beatty Infrastructure, Inc. to design and build the extension
  • 2016: E, F, and R Extension budget and funding grant signed. The project broke ground in May and construction began.
  • 2017: Construction underway throughout every segment of the project and has reached 50 completion milestone.
  • 2019: The E, F, and R Line Extension opened for service on May 17.



  • 2019 Total Ridership: 928,000*

*The total ridership reflects seven months and thirteen days of service in 2019.


Updated March 2020