GWR 811A20
View line GWR
Alerts for train 811A20
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
22%
5/23 runs under 3 min
RT coverage: 23 full · 0 partial · 0 no data
On-time · 90 days
31%
22/71 runs under 3 min
RT coverage: 71 full · 0 partial · 0 no data
Typical delay
+5min
Median at arrival, 90 days
30 days: +5 min
P90
+17min
9 in 10 runs arrive with less than this
30 days: +13 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
- Sun 20 Sept Max en route +96 min · last fix heading to 73251 +95 min
- Wed 23 Sept Max en route +50 min · last fix heading to 73251 +50 min
- Sat 12 Sept Max en route +35 min · last fix heading to 73251 +35 min
- Sun 16 Aug Max en route +39 min · last fix heading to 73251 +35 min
- Thu 13 Aug Max en route +26 min · last fix heading to 73251 +26 min
Distribution · 90 days
71 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 31% · 22
- 3–10 min 42% · 30
- 10–30 min 21% · 15
- 30+ min 6% · 4
On-time by weekday
- 27% M n=11
- 36% T n=11
- 42% W n=12
- 31% T n=13
- 36% F n=11
- 0% S n=1
- 17% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Thu 5 Nov | Slough 14:09 | +4 min | +7 min |
| Wed 4 Nov | Slough 14:13 | +8 min | +8 min |
| Tue 3 Nov | Slough 14:19 | +14 min | +14 min |
| Mon 2 Nov | Slough 14:09 | +5 min | +5 min |
| Sun 1 Nov | Slough 15:58 | +11 min | +11 min |
| Fri 30 Oct | Slough 14:15 | +2 min | +3 min |
| Thu 29 Oct | Maidenhead 14:20 | +7 min | +7 min |
| Sun 25 Oct | Maidenhead 15:59 | +10 min | +10 min |
| Fri 23 Oct | Slough 14:27 | +14 min | +15 min |
| Thu 22 Oct | Slough 14:30 | +17 min | +17 min |
| Wed 21 Oct | Slough 14:23 | +10 min | +10 min |
| Tue 20 Oct | Slough 14:17 | +4 min | +5 min |
| Mon 19 Oct | Slough 14:17 | +4 min | +4 min |
| Sun 18 Oct | Maidenhead 15:58 | +10 min | +13 min |
| Fri 16 Oct | Slough 14:23 | +2 min | +2 min |
| Thu 15 Oct | Slough 14:24 | +3 min | +3 min |
| Wed 14 Oct | Maidenhead 14:24 | +3 min | +3 min |
| Tue 13 Oct | Slough 14:26 | +5 min | +6 min |
| Mon 12 Oct | Maidenhead 14:30 | +9 min | +21 min |
| Sun 11 Oct | Slough 15:47 | +2 min | +5 min |
| Fri 9 Oct | Slough 14:17 | +4 min | +4 min |
| Thu 8 Oct | Slough 14:15 | +1 min | +3 min |
| Wed 7 Oct | Slough 14:15 | +2 min | +2 min |
| Tue 6 Oct | Slough 14:16 | +3 min | +5 min |
| Mon 5 Oct | Maidenhead 14:14 | 0 min | +3 min |
| Sun 4 Oct | 73251 15:47 | +2 min | +5 min |
| Fri 2 Oct | 73251 14:18 | +5 min | +7 min |
| Thu 1 Oct | 73251 14:19 | +6 min | +6 min |
| Wed 30 Sept | 73251 14:18 | +5 min | +41 min |
| Tue 29 Sept | 73251 14:19 | +6 min | +9 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.