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.
The mini-map returns when the train runs
On-time · 30 days
52%
12/23 runs under 3 min
RT coverage: 23 full · 0 partial · 0 no data
On-time · 90 days
49%
36/73 runs under 3 min
RT coverage: 73 full · 0 partial · 0 no data
Typical delay
+3min
Median at arrival, 90 days
30 days: +2 min
P90
+16min
9 in 10 runs arrive with less than this
30 days: +24 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 +46 min · last fix heading to Slough +46 min
- Tue 20 Oct Max en route +36 min · last fix heading to Slough +36 min
- Thu 22 Oct Max en route +30 min · last fix heading to Slough +27 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
Distribution · 90 days
73 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 4% · 3
- On time 45% · 33
- 3–10 min 33% · 24
- 10–30 min 15% · 11
- 30+ min 3% · 2
On-time by weekday
- 58% M n=12
- 58% T n=12
- 27% W n=11
- 46% T n=13
- 50% F n=12
- 54% S n=13
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Thu 5 Nov | Maidenhead 08:13 | +4 min | +4 min |
| Wed 4 Nov | Slough 08:14 | +5 min | +6 min |
| Tue 3 Nov | Maidenhead 08:09 | 0 min | +3 min |
| Mon 2 Nov | Slough 08:08 | −1 min | +1 min |
| Sat 31 Oct | Slough 08:13 | 0 min | — |
| Fri 30 Oct | Slough 08:23 | +5 min | +5 min |
| Thu 29 Oct | Slough 08:17 | 0 min | +1 min |
| Sat 24 Oct | Slough 08:13 | 0 min | +2 min |
| Fri 23 Oct | Slough 08:17 | −1 min | +4 min |
| Thu 22 Oct | Slough 08:44 | +27 min | +30 min |
| Wed 21 Oct | Slough 08:21 | +4 min | +4 min |
| Tue 20 Oct | Slough 08:53 | +36 min | +36 min |
| Mon 19 Oct | Slough 08:20 | +3 min | +3 min |
| Sat 17 Oct | Slough 08:12 | −1 min | — |
| Fri 16 Oct | Slough 09:03 | +46 min | +46 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 |
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.