The A Line (formerly the University of Colorado A Line for

sponsorship Sponsoring something (or someone) is the act of supporting an event, activity, person, or organization financially or through the provision of products or services. The individual or group that provides the support, similar to a benefactor, is k ...

reasons) is a

Regional Transportation District The Regional Transportation District, more commonly referred to as RTD, is the regional agency operating public transit services in eight out of the twelve counties in the Denver-Aurora-Boulder Combined Statistical Area in the U.S. state of Col ...

(RTD)

commuter rail Commuter rail, or suburban rail, is a passenger rail transport service that primarily operates within a metropolitan area, connecting Commuting, commuters to a Downtown, central city from adjacent suburbs or commuter towns. Generally commuter r ...

line serving

Denver Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

and

Aurora An aurora (plural: auroras or aurorae), also commonly known as the polar lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions (around the Arctic and Antarctic). Auroras display dynamic patterns of bri ...

Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...

, operating between

downtown Denver Downtown Denver is the main financial, commercial, business, and entertainment district in Denver, Colorado. There is over of office space in downtown Denver, with 132,000 workers. The downtown area consists mostly of the neighborhoods of Uni ...

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 The University of Colorado (CU) is a system of public universities in Colorado. It consists of four institutions: University of Colorado Boulder, University of Colorado Colorado Springs, University of Colorado Denver, and the University o ...

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 Major (commandant in certain jurisdictions) is a military rank of commissioned officer status, with corresponding ranks existing in many military forces throughout the world. When used unhyphenated and in conjunction with no other indicators ...

was completed for the corridor, encouraging fixed-guideway mass transit ( light rail or

), 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 The Federal Transit Administration (FTA) is an agency within the United States Department of Transportation (DOT) that provides financial and technical assistance to local public transportation systems. The FTA is one of ten modal administration ...

in November 2009. In July 2007, it was decided to use

electric Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by ...

instead of

diesel Diesel may refer to: * Diesel engine, an internal combustion engine where ignition is caused by compression * Diesel fuel, a liquid fuel used in diesel engines * Diesel locomotive, a railway locomotive in which the prime mover is a diesel engin ...

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 Eagle P3 is a public–private partnership (P3) involving the Regional Transportation District (RTD) of Denver, Colorado and Denver Transit Partners, a partnership of several private companies. Under the Eagle P3 signed in 2010, Denver Transit ...

public–private partnership A public–private partnership (PPP, 3P, or P3) is a long-term arrangement between a government and private sector institutions.Hodge, G. A and Greve, C. (2007), Public–Private Partnerships: An International Performance Review, Public Adminis ...

. 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. A software problem in the equipment closing the crossing gates has resulted in the use of

traffic guard Traffic guards, also known as traffic controllers and flaggers, are trained to set up warning signs and barricades to slow down the speed of traffic in a temporary traffic control zone. When they are on scene they will set up equipment to war ...

s and frequent delays since the opening, earning the project a slot on Westword's 2016 Colorado Hall of Shame. Since the A line's opening in April 2016, it has had a number of operational issues. The main issue is with the crossing gate technology. Crossing arms have been coming down too early and staying down too long, causing traffic backups. Today, RTD is making progress in fixing the crossing gate timing system along the A Line. The A Line shares crossings with Union Pacific tracks. This adds complexity to the crossing gate programs and technology. In June 2018, the FRA 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.

Route

The A Line route follows and remains within a mile of Interstate 25,

Interstate 70 Interstate 70 (I-70) is a major east–west Interstate Highway in the United States that runs from I-15 near Cove Fort, Utah, to a park and ride lot just east of I-695 in Baltimore, Maryland, and is the fifth-longest Interstate in the co ...

, and the airport access highway ( Peña Boulevard). The line makes use of a preexisting

Union Pacific Railroad The Union Pacific Railroad , legally Union Pacific Railroad Company and often called simply Union Pacific, is a freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Paci ...

right-of-way Right of way is the legal right, established by grant from a landowner or long usage (i.e. by prescription), to pass along a specific route through property belonging to another. A similar ''right of access'' also exists on land held by a gov ...

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 A union station (also known as a union terminal, a joint station in Europe, and a joint-use station in Japan) is a railway station at which the tracks and facilities are shared by two or more separate railway companies, allowing passengers to ...

the line follows the Union Pacific corridor past

Coors Field Coors Field is a baseball stadium in downtown Denver, Colorado. It is the home field of Major League Baseball's Colorado Rockies. Opened in 1995, the park is located in Denver's Lower Downtown neighborhood, two blocks from Union Station. The ...

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 a station at Peoria Street, which is shared with the R Line. Continuing east, alongside Smith Road, the line passes under Peoria Street and then

Interstate 225 Interstate 225 (I-225) is an auxiliary Interstate Highway in the U.S. state of Colorado. The freeway is a connector spur route of I-25 that acts as an eastern bypass in the Denver metropolitan area and serves Aurora. It also provides direct ...

. Just west of Airport Boulevard, the line rises on a viaduct curving north over the Union Pacific tracks, Airport Boulevard, 32nd Avenue, and

. Having left the Union Pacific corridor, the viaduct then descends to a station at the existing

Park and Ride A park and ride, also known as incentive parking or a commuter lot, is a parking lot with public transport connections that allows commuters and other people heading to city centres to leave their vehicles and transfer to a bus, rail system ( ...

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 E-470 is a controlled-access toll road that traverses the eastern portion of the Denver metropolitan area in the US state of Colorado. It is the eastern half of the 470 beltway that serves Meridian, Parker, Aurora, Denver International Airpor ...

. 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

References

External links

* {{authority control RTD commuter rail Transportation in Aurora, Colorado Airport rail links in the United States 25 kV AC railway electrification Railway lines opened in 2016