Long-lived is the load-bearing word
The train is long-lived. Teams and people stay on it across Planning Intervals; work flows to the train rather than a team being assembled around work. The ART, not the project, is the stable thing.
Why it is like this
Standing teams accumulate the knowledge of their value stream and remove the re-forming cost that dominates project-based delivery. Everything else about the train — cadence, velocity, architectural runway — depends on it being the same people next quarter.
Not to be confused with
A long project. Reconstituting the train around each new initiative gives you all of SAFe's ceremony and none of its argument: the planning overhead is paid every time and the compounding benefit never arrives.
In practice
"We stand up an ART per programme and dissolve it at the end" is the single clearest sign that an organisation has adopted the vocabulary and not the model.
Source: SAFe Glossary (Scaled Agile, Inc.) — Agile Release Train (ART). Read on .
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Odd one out Check yourself
Three of these follow from the ART being long-lived. Which one does not?
Show the answer
The train is disbanded and re-formed for each major initiative
That is the project model the train exists to replace, and it is also the most common way a SAFe adoption quietly becomes one.