Not classified
Cause code ONA04
Plain-language explanation, impact details and live examples.
Last updated 8 Dec 2025, 18:40:56lavin
Announcement phrasing
Train operators typically phrase this cause as:
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Live trains referencing ONA04
Snapshot of services that mentioned this cause during the past 90 minutes and the next 3 hours.
Updated 8 Dec 2025, 18:40
We can't find any current trains referencing this cause.
Frequently asked questions about cause code ONA04
What does cause code ONA04 mean?
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How serious is cause code ONA04?
It is classified as Not classified.
Which trains are currently affected?
See the live examples above. The list refreshes every minute.