GWR 811A27
View line GWR
Alerts for train 811A27
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
42%
8/19 runs under 3 min
RT coverage: 19 full · 0 partial · 0 no data
On-time · 90 days
20%
14/70 runs under 3 min
RT coverage: 70 full · 0 partial · 0 no data
Typical delay
+6min
Median at arrival, 90 days
30 days: +3 min
P90
+18min
9 in 10 runs arrive with less than this
30 days: +11 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
- Sat 5 Sept Max en route +108 min · last fix heading to 74233 +108 min
- Sat 24 Oct Max en route +36 min · last fix heading to Slough +36 min
- Mon 10 Aug Max en route +31 min · last fix heading to 73251 +30 min
- Tue 8 Sept Max en route +21 min · last fix heading to 73251 +21 min
- Wed 29 Jul Max en route +21 min · last fix heading to 73251 +20 min
Distribution · 90 days
70 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 20% · 14
- 3–10 min 47% · 33
- 10–30 min 29% · 20
- 30+ min 4% · 3
On-time by weekday
- 18% M n=11
- 25% T n=12
- 9% W n=11
- 17% T n=12
- 8% F n=12
- 42% S n=12
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Sat 24 Oct | Slough 18:19 | +36 min | +36 min |
| Fri 23 Oct | Slough 17:58 | +15 min | +15 min |
| Thu 22 Oct | Maidenhead 17:52 | +9 min | +9 min |
| Wed 21 Oct | Slough 17:48 | +5 min | +5 min |
| Tue 20 Oct | Slough 17:46 | +2 min | +2 min |
| Mon 19 Oct | Maidenhead 17:45 | +1 min | +1 min |
| Sat 17 Oct | Slough 17:42 | 0 min | +1 min |
| Sat 10 Oct | Slough 17:42 | −1 min | +1 min |
| Fri 9 Oct | Slough 17:45 | +1 min | +2 min |
| Thu 8 Oct | Maidenhead 17:46 | +3 min | +3 min |
| Tue 6 Oct | Slough 17:43 | 0 min | — |
| Mon 5 Oct | Maidenhead 17:48 | +5 min | +5 min |
| Sat 3 Oct | 73251 17:46 | +3 min | +3 min |
| Fri 2 Oct | 73251 17:49 | +6 min | +6 min |
| Thu 1 Oct | 73251 17:44 | +1 min | +1 min |
| Wed 30 Sept | 73251 17:47 | +3 min | +3 min |
| Tue 29 Sept | 73251 17:46 | +3 min | +5 min |
| Mon 28 Sept | 73251 17:53 | +10 min | +10 min |
| Sat 26 Sept | 73251 17:46 | +2 min | +2 min |
| Fri 25 Sept | 73251 17:54 | +11 min | +11 min |
| Thu 24 Sept | 73251 17:57 | +14 min | +14 min |
| Wed 23 Sept | 74331 17:18 | +13 min | +13 min |
| Tue 22 Sept | 73251 17:52 | +9 min | +9 min |
| Mon 21 Sept | 73251 17:47 | +3 min | +4 min |
| Sat 19 Sept | 73251 18:01 | +18 min | +18 min |
| Fri 18 Sept | 73251 17:53 | +10 min | +10 min |
| Thu 17 Sept | 73251 17:55 | +11 min | +11 min |
| Wed 16 Sept | 73251 17:51 | +8 min | +9 min |
| Tue 15 Sept | 73251 17:51 | +8 min | +8 min |
| Mon 14 Sept | 73251 17:43 | 0 min | +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.