GWR 811A21
View line GWR
Alerts for train 811A21
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
27%
7/26 runs under 3 min
RT coverage: 26 full · 0 partial · 0 no data
On-time · 90 days
28%
22/78 runs under 3 min
RT coverage: 78 full · 0 partial · 0 no data
Typical delay
+5min
Median at arrival, 90 days
30 days: +4 min
P90
+21min
9 in 10 runs arrive with less than this
30 days: +12 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
- Wed 23 Sept Max en route +36 min · last fix heading to 74331 +36 min
- Sun 20 Sept Max en route +28 min · last fix heading to 73251 +28 min
- Wed 19 Aug Max en route +27 min · last fix heading to 73251 +27 min
- Tue 21 Jul Max en route +25 min · last fix heading to 73251 +25 min
- Thu 13 Aug Max en route +24 min · last fix heading to 73251 +24 min
Distribution · 90 days
78 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 28% · 22
- 3–10 min 44% · 34
- 10–30 min 27% · 21
- 30+ min 1% · 1
On-time by weekday
- 10% M n=10
- 60% T n=10
- 17% W n=12
- 33% T n=12
- 36% F n=11
- 18% S n=11
- 25% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Sun 11 Oct | Slough 16:13 | 0 min | +1 min |
| Sat 10 Oct | Maidenhead 14:50 | +7 min | +8 min |
| Fri 9 Oct | Slough 14:46 | +3 min | +3 min |
| Thu 8 Oct | Maidenhead 14:44 | +1 min | +2 min |
| Wed 7 Oct | Slough 14:46 | +3 min | +3 min |
| Tue 6 Oct | Maidenhead 14:45 | +2 min | +4 min |
| Mon 5 Oct | Slough 14:47 | +4 min | +4 min |
| Sun 4 Oct | 73251 16:16 | +3 min | +5 min |
| Sat 3 Oct | 73251 14:47 | +4 min | +6 min |
| Fri 2 Oct | 73251 14:44 | +1 min | +2 min |
| Thu 1 Oct | 73251 14:53 | +10 min | +10 min |
| Wed 30 Sept | 73251 14:47 | +4 min | +4 min |
| Tue 29 Sept | 73251 14:47 | +4 min | +4 min |
| Mon 28 Sept | 73251 14:57 | +14 min | +14 min |
| Sun 27 Sept | 73251 16:27 | +8 min | +8 min |
| Sat 26 Sept | 73251 14:46 | +2 min | +4 min |
| Fri 25 Sept | 73251 14:49 | +6 min | +6 min |
| Thu 24 Sept | 73251 14:49 | +6 min | +6 min |
| Wed 23 Sept | 74331 14:41 | +36 min | +36 min |
| Tue 22 Sept | 73251 14:46 | +3 min | +3 min |
| Sun 20 Sept | 73251 16:42 | +28 min | +28 min |
| Sat 19 Sept | 73251 14:46 | +3 min | +7 min |
| Fri 18 Sept | 73251 14:52 | +9 min | +9 min |
| Thu 17 Sept | 73251 14:44 | +1 min | +1 min |
| Wed 16 Sept | 73251 14:49 | +7 min | +7 min |
| Tue 15 Sept | 73251 14:45 | +2 min | +4 min |
| Mon 14 Sept | 73251 14:50 | +7 min | +8 min |
| Fri 11 Sept | 73251 14:48 | +5 min | +5 min |
| Thu 10 Sept | 73251 14:51 | +8 min | +8 min |
| Wed 9 Sept | 73251 14:42 | −1 min | +1 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.