Chiltern Railways 631P51
View line Chiltern Railways
Alerts for train 631P51
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line Chiltern Railways.
The mini-map returns when the train runs
On-time · 30 days
83%
10/12 runs under 3 min
RT coverage: 12 full · 0 partial · 0 no data
On-time · 90 days
83%
25/30 runs under 3 min
RT coverage: 30 full · 0 partial · 0 no data
Typical delay
−1min
Median at arrival, 90 days
30 days: −1 min
P90
+7min
9 in 10 runs arrive with less than this
30 days: +7 min
Last 30 days
Delay at the end of each run, in minutes. One bar per run.
- On time (<3 min)
- 3–10 min
- 10–30 min
- 30+ min
- Partial coverage
- No data
Worst days
- Tue 8 Sept Max en route +20 min · last fix heading to Princes Risborough +18 min
- Thu 24 Sept Max en route +11 min · last fix heading to Princes Risborough +11 min
- Thu 8 Oct Max en route +9 min · last fix heading to Princes Risborough +8 min
- Thu 27 Aug Max en route +7 min · last fix heading to Princes Risborough +7 min
- Wed 29 Jul Max en route +8 min · last fix heading to Princes Risborough +6 min
Distribution · 90 days
30 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 27% · 8
- On time 57% · 17
- 3–10 min 10% · 3
- 10–30 min 7% · 2
- 30+ min 0% · 0
On-time by weekday
- — M n=0
- 89% T n=9
- 90% W n=10
- 73% T n=11
- — F n=0
- — S n=0
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Wed 14 Oct | Princes Risborough 18:27 | +1 min | +3 min |
| Tue 13 Oct | Saunderton 18:29 | +2 min | +3 min |
| Thu 8 Oct | Princes Risborough 18:35 | +8 min | +9 min |
| Wed 7 Oct | Princes Risborough 18:25 | −2 min | +1 min |
| Thu 1 Oct | Princes Risborough 18:25 | −1 min | +1 min |
| Wed 30 Sept | Princes Risborough 18:24 | −2 min | — |
| Thu 24 Sept | Princes Risborough 18:38 | +11 min | +11 min |
| Wed 23 Sept | Princes Risborough 18:24 | −2 min | +3 min |
| Tue 22 Sept | Princes Risborough 18:24 | −2 min | +4 min |
| Thu 17 Sept | Princes Risborough 18:25 | −1 min | +2 min |
| Wed 16 Sept | Princes Risborough 18:26 | 0 min | +4 min |
| Tue 15 Sept | Princes Risborough 18:24 | −3 min | +2 min |
| Thu 10 Sept | Princes Risborough 18:25 | −1 min | +1 min |
| Tue 8 Sept | Princes Risborough 18:44 | +18 min | +20 min |
| Thu 3 Sept | Princes Risborough 18:27 | 0 min | +2 min |
| Wed 2 Sept | Princes Risborough 18:25 | −1 min | +2 min |
| Tue 1 Sept | Princes Risborough 18:25 | −2 min | +1 min |
| Thu 27 Aug | Princes Risborough 18:34 | +7 min | +7 min |
| Wed 26 Aug | Princes Risborough 18:26 | −1 min | +1 min |
| Tue 25 Aug | Princes Risborough 18:25 | −1 min | +1 min |
| Thu 20 Aug | Princes Risborough 18:29 | +2 min | +2 min |
| Wed 12 Aug | Princes Risborough 18:28 | +1 min | +1 min |
| Tue 11 Aug | Princes Risborough 18:24 | −3 min | +2 min |
| Thu 6 Aug | Princes Risborough 18:25 | −1 min | +1 min |
| Wed 5 Aug | Princes Risborough 18:28 | +1 min | +4 min |
| Tue 4 Aug | Princes Risborough 18:27 | 0 min | +7 min |
| Thu 30 Jul | Princes Risborough 18:27 | +1 min | +2 min |
| Wed 29 Jul | Princes Risborough 18:32 | +6 min | +8 min |
| Thu 23 Jul | Princes Risborough 18:26 | −1 min | +1 min |
| Tue 21 Jul | Princes Risborough 18:24 | −2 min | — |
Each run is closed into train_runs (country, train number, service day) from the live positions. Final delay = last delay seen. Partial coverage: the feed stopped before the final stop (last value used, hatched in the chart). No data: a run without any valid delay; counts as neither on time nor late. Data collected since 11 July 2026.