an unspecified impact level
Cause code ONA
Plain-language explanation, impact details and live examples.
Last updated 21 May 2026, 17:04:52Nationell
Announcement phrasing
Train operators typically phrase this cause as:
Nationell
Live trains referencing ONA
Snapshot of services that mentioned this cause during the past 90 minutes and the next 3 hours.
Updated 21 May 2026, 17:04
We can't find any current trains referencing this cause.
Frequently asked questions about cause code ONA
What does cause code ONA mean?
Nationell
How serious is cause code ONA?
It is classified as an unspecified impact level.
Which trains are currently affected?
See the live examples above. The list refreshes every minute.