Guide
What is TRAX?
TRAX is Utah Transit Authority's light-rail network serving the Salt Lake Valley. Three color-coded lines — Blue, Red, and Green — connect the airport, downtown Salt Lake City, the University of Utah, South Jordan, West Valley City, and Draper. If you're wondering where your TRAX train is right now, real-time tracking is the fastest answer.
How to see live TRAX trains
The best way to see live TRAX positions is to open UTA Tracker and select the TRAX view. Each active train appears as a moving marker on the map, colored by line. The map refreshes continuously using official UTA GTFS-realtime vehicle position data, so you're always seeing the most current snapshot.
- Go to utatracker.com/trax on any device — no app download needed.
- Select a line (Blue, Red, or Green) to filter the map to that corridor.
- Tap any train icon to see its current trip, next stop, and on-time status.
- The live map auto-updates without requiring a manual page refresh.
Reading the map
Each vehicle marker shows the line color and direction of travel. A label indicates the route designation and terminus. If a train is running ahead of schedule it may show as slightly early; a delay badge appears when the GTFS-realtime trip update reports a positive delay. The line shapes on the map let you orient yourself quickly — pick the nearest stop along the colored corridor.
Stop arrivals
Tap any stop on the TRAX map to open the stop arrival board. You'll see upcoming trains sorted by estimated arrival time, with distinction between the scheduled time (from the static timetable) and the live projected time (adjusted from real-time trip updates). When the tracker shows “2 min” next to a line, that means the train is projected to reach that stop in two minutes based on its current position and trip progress.
Service alerts
UTA publishes service alerts through its GTFS-realtime alerts feed. UTA Tracker surfaces these automatically — if there's a track outage, shuttle replacement, or major delay on a TRAX line, an alert banner appears on the relevant route or stop page. Always check alerts before planning a trip during peak maintenance windows or special events near downtown Salt Lake City.