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A Line
A
A Line train at the Denver Airport station
Overview
Owner	Regional Transportation District
Locale	Denver metropolitan area
Termini	Union Station Denver Airport
Stations	8
Website	Official website
Service
Type	Commuter rail
System	RTD Rail
Operator(s)	Denver Transit Partners
Rolling stock	Hyundai Rotem Silverliner V
Daily ridership	20,600 (2019)
Ridership	7,042,000 (2018, annual)
History
Opened	April 22, 2016; 8 years ago (2016-04-22)
Technical
Line length	23.5 mi (37.82 km)
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrification	Overhead line, 25 kV 60 Hz AC
Route map A Line highlighted in blue Show interactive map Legend Denver Airport E-470 Fare Zone Boundary 61st & Peña 40th Ave & Airport Blvd–Gateway Park I-70 I-225 Peoria  R  Central Park SH 2 Colorado Boulevard 40th & Colorado 38th & Blake  L   B  G  N  Amtrak California Zephyr Union Station  B  G  N   E  W  This diagram: view talk edit Show route diagram

The A Line (formerly the University of Colorado A Line for sponsorship reasons) is a Regional Transportation District (RTD) commuter rail line serving Denver and Aurora, Colorado, operating between downtown Denver and Denver International Airport (DIA). During planning and construction, it was also known as the East Rail Line, but most locals refer to it as the A Line. Despite its former title, the line does not serve the campuses of the University of Colorado.

History

Mass transit has been under consideration for the corridor between Downtown Denver and Denver International Airport since the latter was proposed in the 1980s. The project gathered momentum in 1997 when a Major Investment Study was completed for the corridor, encouraging fixed-guideway mass transit (light rail or commuter rail), highway widening and general improvements. The project was approved as part of the FasTracks transit expansion package in November 2004, went through regulatory processes and was approved by the Federal Transit Administration in November 2009. In July 2007, it was decided to use electric instead of diesel propulsion over speed and air pollution concerns.

RTD designated the line with the letter “A”, denoting service to the airport and Aurora. Groundbreaking for the A Line was held on August 26, 2010. As the second line of RTD's FasTracks expansion plan, the East Corridor was constructed and operated under the Eagle P3 public–private partnership. The first electric multiple unit railcars were pulled along the route on April 3, 2015, commencing testing and commissioning of the line.

Revenue service began on April 22, 2016.

From the A line's opening in April 2016, until mid-2018, there had been operational issues with the crossing gates due to software problems, resulting in frequent delays. Crossing arms had been coming down too early and staying down too long, causing traffic backups. RTD made progress correcting this, along with the use of traffic guards, earning the project a slot on Westword's 2016 Colorado Hall of Shame. Also, the A Line shares crossings with Union Pacific tracks, adding to the complexity to the crossing gate's program and technology.

In June 2018, the FRA (Federal Railroad Administration of the Dept of Transportation) approved a plan to remove the flaggers monitoring the crossing gates along the A Line. This approval also allows local jurisdictions to submit requests to the FRA to establish "quiet zones", removing the need for trains crossing through the gates to blow their horns. As of February 2019, approval for "quiet zones" at nine of the line's crossings has been granted, to be in effect on March 1, 2019; see Normal Whistle Codes.

Route

The A Line route follows and remains within a mile of Interstate 25, Interstate 70, and the airport access highway (Peña Boulevard). The line makes use of a preexisting Union Pacific Railroad right-of-way along the portion of the route from downtown Denver heading east, then deviates to the north along Peña Boulevard in a newly created right-of-way. Peña Boulevard was designed with an extra-wide median between its inbound and outbound lanes that could have been used for rail transit, though ultimately the East Rail Corridor alignment was offset from the highway right-of-way.

Leaving Union Station the line follows the Union Pacific corridor past Coors Field to reach a station at 38th and Blake Streets shared with the future Central Corridor expansion. From there the line turns east alongside 40th Avenue past the Denver Union Pacific Intermodal Yard. Just east of Josephine Street the corridor turns two blocks north then east again to stay along the Union Pacific corridor to reach the 40th Avenue and Colorado Boulevard station. After passing under Colorado Boulevard the line parallels Smith Road, with a station at Central Park Boulevard in the redevelopment area of the decommissioned Stapleton International Airport. Shortly after entering Aurora, the line reaches Peoria Station, which is shared with the R Line. Continuing east, alongside Smith Road, the line passes under Peoria Street and then Interstate 225. Just west of Airport Boulevard, the line rises on a viaduct curving north over the Union Pacific tracks, Airport Boulevard, 32nd Avenue, and Interstate 70. Having left the Union Pacific corridor, the viaduct then descends to a station at the existing Park and Ride at 40th Avenue and Airport Boulevard. From there the line reenters Denver, following the east side of Peña Boulevard. North of 56th Avenue it enters an added to the line construction Peña Boulevard station at 61st Avenue. The line continues north and east, parallel to Peña Boulevard and crossing over E-470. Turning north, the line crosses over Peña Boulevard adjacent to DIA runway 7/25 and then runs east between the airport secure area and 78th Avenue. The line then crosses over the south/west terminal exit lanes of Peña Boulevard ending at a station on the south side of the DIA Hotel and Transit Center, itself at the south end of the DIA Jeppesen Terminal.

Stations

Fare zone	Station	Municipality	Opened	Major connections & notes
Local	Union Station	Denver	April 22, 2016	B  E  G  N  W  California Zephyr MallRide Flatiron Flyer
	38th & Blake			Park and ride: 200 spaces
	40th & Colorado			Park and ride: 200 spaces
	Central Park			Park and ride: 1,500 spaces
	Peoria	Aurora		R  Park and ride: 550 spaces
	40th Ave & Airport Blvd–Gateway Park			Park and ride: 1,079 spaces
	61st & Peña	Denver		Parking: 800 (paid)
Airport	Denver Airport			Denver International Airport

References

1. ^ "Eagle P3 Commuter Rail Project, Denver, USA". Railway Technology. Archived from the original on September 3, 2011. Retrieved September 1, 2011.
2. Aguilar, John (May 2, 2019). "A-Line marks 20 million passengers since train to Denver International Airport opened in 2016". Denver Post. Retrieved August 27, 2019.
3. "RTD Monthly Financial Report" (PDF). RTD. December 30, 2018. Archived from the original (PDF) on March 25, 2019. Retrieved March 23, 2019.
4. "Commuter train testing begins on G Line". RTD FasTracks. Regional Transportation District of Denver. Retrieved July 25, 2016.
5. Harden, Mark (August 19, 2015). "The A line goes to college: CU paid $5 million for RTD airport-rail naming rights". Denver Business Journal. Retrieved February 29, 2016.
6. ^ "RTD - East Rail Line". Regional Transportation District. Retrieved April 29, 2015.
7. "Stories Along the Line: East Rail to roll on historical ground". www.rtd-fastracks.com. Retrieved May 3, 2017.
8. "Fastracks - East Corridor". Regional Transportation District. Archived from the original on January 7, 2011. Retrieved April 29, 2010.
9. "Electric Multiple Unit" (PDF). East Corridor Environmental Impact Statement. Archived from the original (PDF) on November 20, 2008. Retrieved July 23, 2014.
10. "East Corridor Groundbreaking!". Denver Infill Blog. Archived from the original on October 2, 2011. Retrieved July 26, 2010.
11. "Denver's new EMUs take "maiden voyage"". Railway Age. Retrieved April 7, 2015.
12. "RTD service from Union Station to DIA scheduled to start April 22". The Denver Channel. Archived from the original on October 24, 2015. Retrieved October 22, 2015.
13. "Feds give RTD another 90 days fix A-Line crossing problems – The Denver Post". February 2017. Retrieved February 6, 2017.
14. "The Eight Inductees into the 2016 Colorado Hall of Shame". December 29, 2016.
15. "A-Line's noisy train horns' days are numbered, as RTD plans to pull flaggers back from six crossings starting Friday". The Denver Post. June 19, 2018. Retrieved July 19, 2018.
16. "RTD and Denver receive approvals to implement quiet zones on sections of the University of Colorado A Line" (PDF). Regional Transportation District. February 8, 2019. Retrieved November 7, 2021.
17. "New train station part of East Rail". rtd-fastracks.com. Regional Transportation District. Archived from the original on August 22, 2015. Retrieved August 20, 2015.
18. "RTD - A Line". RTD - A Line. Regional Transportation District. Archived from the original on October 3, 2018. Retrieved June 21, 2015.
19. Hodes, David. "Colorado Experiences Phenomenal Success (with Photo)". Business Xpansion Journal. Retrieved June 15, 2015.
20. "Eagle P3 Project update", Fast Tracks Monitor Committee, May 13, 2014
21. "Hotel and Transit Center". FlyDenver.com. Archived from the original on July 2, 2015. Retrieved May 31, 2010.
22. "Appendix A Preferred Alternate Maps" (PDF). East Corridor Environmental Impact Statement. Retrieved April 29, 2010.
23. "Peña Station Rail Stop", Flydenver.com, 2015
24. "61st & Peña Station Area Plan" Archived June 21, 2015, at the Wayback Machine, City and County of Denver, January 13, 2014

External links

• Official website

v t e Regional Transportation District bus and rail services
Operators	Current Regional Transportation District Denver Transit Partners Former Denver Tramway/Denver Metro Transit (1886–1971)
Rail services	Commuter rail  A  A Line  B  B Line  G  G Line  N  N Line Light rail  D  D Line  E  E Line  H  H Line  L  L Line  R  R Line  W  W Line Defunct lines  C  C Line  F  F Line  G  G Line (2006–2009) Future extensions B Line: Boulder/Longmont extension D Line: Highlands Ranch extension L Line: Central Rail extension/loop N Line: North Thornton/Hwy 7 extension Stations List of Denver RTD rail stations
Bus services	Flatiron Flyer MallRide Special services
Other topics	Transportation Expansion Project FasTracks

• RTD commuter rail
• Transportation in Aurora, Colorado
• Airport rail links in the United States
• 25 kV AC railway electrification
• Railway lines opened in 2016
• 2016 establishments in Colorado