The E Line is a light rail line which is part of the rail system operated by the Regional Transportation District in the Denver metropolitan area in Colorado. The line was added to the system on November 17, 2006, with the completion of the Southeast Corridor as part of the T-REX Project. It is one of four routes that are part of the RTD's service plan for the corridor.

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E Line
E
E Line at 10th & Osage by a Union Pacific rail yard
Overview
Owner	Regional Transportation District
Locale	Denver metropolitan area
Termini	Union Station RidgeGate Parkway
Stations	21
Service
Type	Light rail
System	RTD Rail
Operator(s)	Regional Transportation District
History
Opened	November 17, 2006
Technical
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Electrification	Overhead line, 750 V DC
Route diagram Legend Amtrak California Zephyr Union Station  A  B  G  N   W  Ball Arena–Elitch Gardens Empower Field at Mile High Auraria West  W   D  H  10th & Osage US 6 6th Avenue Freeway Alameda I-25 I-25 & Broadway  D  Louisiana–Pearl University of Denver Colorado Yale Southmoor  H  R  Belleview Orchard Arapahoe at Village Center Dry Creek County Line SH 470 / E-470 Lincoln  R  Sky Ridge I-25 Lone Tree City Center RidgeGate Parkway This diagram: view talk edit

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According to a map in the RTD's current service plan for the corridor, the E Line's color is purple, also referred to as 'plum'.

Beginning May 26, 2024, the E Line will operate at a 60 minute headway due to repairs of the coping panels on the Southeast Corridor. This is a reduction from the line's typical 15 minute headways.^[1]

The E Line's northern terminus is at Union Station in downtown Denver. It shares track with the D Line from Union Station to I-25 & Broadway, then diverges by a level junction onto a flyover, and then parallels Interstate 25 from there to Lincoln Avenue in Lone Tree.^[2] On May 17, 2019, it was extended south by 2.3 miles (3.7 km) to RidgeGate Parkway station in Lone Tree.^[3]

The 2004 voter-approved FasTracks initiative included the Southeast Corridor extension for the E and F Line, which extended the lines by 2.3 mi (3.70 km) to southern Lone Tree. The extension cost $223 million to construct and was opened on May 17, 2019. It included three new stations, Sky Ridge, Lone Tree City Center, and RidgeGate Parkway, the latter with a 1,300-stall parking facility.^[4]