GWR 811A04
View line GWR
Alerts for train 811A04
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line GWR.
On-time · 30 days
44%
11/25 runs under 3 min
RT coverage: 25 full · 0 partial · 0 no data
On-time · 90 days
51%
38/75 runs under 3 min
RT coverage: 75 full · 0 partial · 0 no data
Typical delay
+2min
Median at arrival, 90 days
30 days: +3 min
P90
+16min
9 in 10 runs arrive with less than this
30 days: +18 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
- Fri 16 Oct Max en route +45 min · last fix heading to Slough +44 min
- Mon 3 Aug Max en route +39 min · last fix heading to 73251 +37 min
- Mon 28 Sept Max en route +28 min · last fix heading to 73251 +25 min
- Fri 25 Sept Max en route +21 min · last fix heading to 73251 +21 min
- Mon 14 Sept Max en route +20 min · last fix heading to 74331 +20 min
Distribution · 90 days
75 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 4% · 3
- On time 47% · 35
- 3–10 min 31% · 23
- 10–30 min 16% · 12
- 30+ min 3% · 2
On-time by weekday
- 54% M n=13
- 50% T n=12
- 42% W n=12
- 54% T n=13
- 62% F n=13
- 42% S n=12
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Fri 16 Oct | Slough 08:49 | +44 min | +45 min |
| Thu 15 Oct | Slough 08:19 | +2 min | +3 min |
| Wed 14 Oct | Maidenhead 08:15 | −2 min | +2 min |
| Tue 13 Oct | Slough 08:16 | −1 min | +1 min |
| Mon 12 Oct | Slough 08:28 | +11 min | +16 min |
| Sat 10 Oct | Slough 08:13 | −1 min | +1 min |
| Fri 9 Oct | Maidenhead 08:18 | +1 min | +6 min |
| Thu 8 Oct | Slough 08:31 | +14 min | +14 min |
| Wed 7 Oct | Slough 08:22 | +5 min | +6 min |
| Tue 6 Oct | Slough 08:17 | 0 min | +3 min |
| Mon 5 Oct | 73251 08:17 | 0 min | +1 min |
| Sat 3 Oct | 73251 08:18 | +5 min | +5 min |
| Fri 2 Oct | 73251 08:17 | 0 min | +7 min |
| Thu 1 Oct | 73251 08:24 | +6 min | +11 min |
| Wed 30 Sept | 73251 08:22 | +6 min | +6 min |
| Tue 29 Sept | 73251 08:26 | +9 min | +25 min |
| Mon 28 Sept | 73251 08:42 | +25 min | +28 min |
| Sat 26 Sept | 73251 08:16 | +3 min | +3 min |
| Fri 25 Sept | 73251 08:38 | +21 min | +21 min |
| Thu 24 Sept | 73251 08:24 | +6 min | +7 min |
| Tue 22 Sept | 73251 08:22 | +5 min | +5 min |
| Mon 21 Sept | 73251 08:14 | −3 min | +2 min |
| Sat 19 Sept | 73251 08:13 | 0 min | +2 min |
| Fri 18 Sept | 73251 08:20 | +3 min | +4 min |
| Thu 17 Sept | 73251 08:17 | 0 min | +1 min |
| Wed 16 Sept | 73251 08:27 | +11 min | +11 min |
| Tue 15 Sept | 73251 08:17 | 0 min | +2 min |
| Mon 14 Sept | 74331 07:36 | +20 min | +20 min |
| Sat 12 Sept | 73251 08:38 | +5 min | +5 min |
| Fri 11 Sept | 73251 08:21 | +5 min | +6 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.