A Line (RTD)
| A Line | |||
|---|---|---|---|
 | |||
 A Line train at the Denver Airport station | |||
| Overview | |||
| Other name | East Line | ||
| Owner | Regional Transportation District | ||
| Locale | Denver metropolitan area | ||
| Termini | |||
| Stations | 8 | ||
| Website | Official website | ||
| Service | |||
| Type | Commuter rail | ||
| System | RTD Rail | ||
| Operator | Denver Transit Partners | ||
| Rolling stock | Hyundai Rotem Silverliner V | ||
| Daily ridership | 20,600 (2019) | ||
| Ridership | 6,184,000 (FY2023, annual) | ||
| History | |||
| Opened | April 22, 2016 | ||
| 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 | ||
| |||
The A Line is a Regional Transportation District (RTD) commuter rail line that serves stations in Denver and Aurora, Colorado. The A Line opened on April 22, 2016, is owned by RTD, and is operated by Denver Transit Partners. During planning and construction, it was also known as the East Line. The line received its letter designation to denote service to Denver International Airport and Aurora. It is colored light blue on system maps.
The A Line's western terminus is at Union Station in downtown Denver, and its eastern terminus is at Denver Airport station, located directly beneath Denver International Airport. It was the first commuter rail line in the RTD rail network to open. With over 6 million passengers using the A Line in 2023, it is by far RTD's most popular rapid transit route of any kind - commuter rail, light rail, or bus.