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The Colorado Department of Transportation's Interregional Express bus service, branded as Bustang, is an intercity bus service in the state of Colorado. Operations are contracted to Ace Express Coaches, Alpine Express, Puelbo Senior Resource Development Agency (SRDA), and Southern Colorado Community Action Agency (SoCoCAA).

There are two levels of service: Bustang are the original three lines serving Denver plus the route to Denver Tech Center. Branch lines to smaller communities are branded as Bustang Outrider. Bustang buses are in an eyecatching purple and black livery, while Bustang Outrider buses are in a similar teal and black livery.


In response to Greyhound service cutbacks in the state, the Colorado Department of Transportation launched a new Interregional Express bus service. Three lines were part of the service launch: the North Line from Fort Collins to Denver, the West Line from Glenwood Springs to Denver, and the South Line from Colorado Springs to Denver. While service was originally commuter-focused and operated on weekdays only, weekend service was added to all three lines by 2017.

With ridership exceeding expectations, service was expanded starting in 2018.[1] The West Line was extended to Grand Junction in mid-2018. As well, new rural routes branded as Bustang Outrider were introduced: between Lamar, Puelbo and Alamosa in early 2018, and Gunnison-Denver in September 2018. The Durango-Grand Junction route operated by Road Runner Stage Lines was also rebranded and supplied with new vehicles in September 2018.[2] A fourth mainline route between Colorado Springs and the Denver Tech Center started in December 2018.[3]

A new "Snowstang" service began operation in December 2019, connecting Denver to ski resorts in Arapahoe Basin, Loveland Ski Area, and Steamboat Springs. Snowstang service operates on Saturdays, Sundays, and holidays from December to mid-April.[4] The initial operating season was cut short due to concerns over COVID-19.


  • Bustang
    • North Line: Fort Collins - Denver
    • West Line: Grand Junction - Denver
    • South Line: Colorado Springs - Denver
    • Colorado Springs - Denver Tech Center
  • Bustang Outrider
    • Lamar - Pueblo - Colorado Springs (operated by Puelbo SRDA)
    • Alamosa - Pueblo (operated by Puelbo SRDA)
    • Durango - Grand Junction (operated by SoCoCAA)
    • Gunnison - Denver (operated by Alpine Express)
  • Special services
    • RamsRoute (weekend service from Colorado State University to Denver)
    • Broncos Bus (special Sunday trips from Fort Collins/Colorado Springs to Denver)
    • Snowstang (weekend/holday service from Denver to Arapahoe Basin, Loveland, Steamboat)


Thumbnail Build
Manufacturer Model Engine Transmission Livery Notes
38000-38025 2015 MCI D4500CL Bustang
(2 units) MCI D4500CL Bustang Outrider
  • Operated by Alpine Express on Gunnison-Denver route.
(3 units) 2018 Van Hool CX35 Cummins ISL9 Allison B500R Bustang Outrider
  • Operated by Puelbo SRDA on Lamar-Puelbo-Colorado Springs and Alamosa-Puelbo routes.
(2 units) 2018 Van Hool CX35 Cummins ISL9 Allison B500R Bustang Outrider
  • Operated by SoCoCAA on Durango-Grand Junction route.

External links


  1. Bustang Exceeds Ridership, Revenue Projections as it Hits 3-Year Anniversary, Colorado Department of Transportation, published July 13, 2018.
  2. Road Runner bus line to join state network, Pine River Times, published January 2, 2018.
  3. Bustang Set to Bridge the Gap, Bustang, published December 13, 2018.
  4. CDOT Launching Snowstang Service between Denver and Ski Resorts, Bustang, published December 10, 2019.