The Transportation Expansion Project, known as T‑REX, in Denver’s Southeast Corridor, was the largest multimodal design-build light rail initiative in the country at the time of its delivery. The $1.7 billion program introduced a 19.7‑mile light rail extension running from Broadway Station to Lincoln Avenue along I‑25 and from I‑25 to Parker Road along I‑225. Combining major highway improvements with expanded transit service, the program helped transform mobility across one of the region’s fastest-growing corridors. The Federal Transit Administration (FTA) engaged STV to provide Project Management Oversight for both the transit and highway components.
What challenges did STV address?
The scale of T‑REX required managing a multimodal program with significant coordination among the FTA, the Federal Highway Administration, the Regional Transportation District and multiple contracting teams. The corridor faced heavy daily traffic and stringent construction constraints, requiring close oversight to maintain safety, minimize disruptions and ensure compliance with federal standards.
What solutions did STV deliver?
STV oversaw project management activities for the entire program, evaluating schedule, cost, design quality, risk and construction performance for both the light rail and highway components. As part of its Denver oversight order, FTA also tasked STV with oversight of the West Corridor Light Rail Extension, a 12‑mile corridor with twelve stations extending to the Jefferson County Government Center in Golden, Colorado. STV monitored design‑build performance, verified contractor compliance and ensured that federal guidelines were met throughout delivery.
How does this project benefit the region?
T‑REX delivered new multimodal connections that improved travel times, expanded transit access and reduced congestion across Denver’s Southeast Corridor. The combined highway and light rail improvements support long‑term regional growth and enhance mobility options for residents and commuters.
Key stats and accolades
- 19.7‑mile multimodal light rail and highway program
- $1.7 billion design–build project
- FTA Project Management Oversight by STV
- Additional oversight of 12‑mile West Corridor extension
