- If the train is stationary at its departure station
- Up to 5 minutes after the train has left its departure station
- Up to 3 minutes before the train arrives at a station
- Whilst the train is stopped at a station
- Up to 3 minutes after the train leaves a station
- Up to 10 minutes before the train arrives at its final destination
- Any time at all (if you’re an ignoramus)
As I’ve written in detail before, we should get rid of quiet carriages. It’s the expectation that kills you.