GWR 851A80
View line GWR
Alerts for train 851A80
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
26%
6/23 runs under 3 min
RT coverage: 23 full · 0 partial · 0 no data
On-time · 90 days
19%
16/83 runs under 3 min
RT coverage: 83 full · 0 partial · 0 no data
Typical delay
+9min
Median at arrival, 90 days
30 days: +9 min
P90
+30min
9 in 10 runs arrive with less than this
30 days: +31 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
- Mon 14 Sept Max en route +49 min · last fix heading to 73251 +49 min
- Sun 13 Sept Max en route +46 min · last fix heading to 73251 +46 min
- Sun 9 Aug Max en route +53 min · last fix heading to 73251 +44 min
- Sun 27 Sept Max en route +41 min · last fix heading to 73251 +41 min
- Sun 25 Oct Max en route +39 min · last fix heading to Theale +39 min
Distribution · 90 days
83 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 19% · 16
- 3–10 min 31% · 26
- 10–30 min 39% · 32
- 30+ min 11% · 9
On-time by weekday
- 17% M n=12
- 33% T n=12
- 17% W n=12
- 8% T n=12
- 18% F n=11
- 33% S n=12
- 8% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Sat 31 Oct | Slough 13:53 | +16 min | +20 min |
| Fri 30 Oct | Maidenhead 13:47 | +10 min | +10 min |
| Thu 29 Oct | Maidenhead 13:41 | +4 min | +13 min |
| Wed 28 Oct | Maidenhead 13:45 | +8 min | +18 min |
| Tue 27 Oct | Slough 13:47 | +10 min | +10 min |
| Mon 26 Oct | Slough 14:10 | +33 min | +38 min |
| Sun 25 Oct | Theale 14:16 | +39 min | +39 min |
| Sat 24 Oct | Slough 13:59 | +21 min | +26 min |
| Thu 22 Oct | Maidenhead 13:48 | +11 min | +21 min |
| Wed 21 Oct | Slough 14:12 | +35 min | +43 min |
| Tue 20 Oct | Maidenhead 13:37 | +1 min | +3 min |
| Mon 19 Oct | Slough 13:46 | +9 min | +17 min |
| Sun 18 Oct | Maidenhead 13:40 | +3 min | +5 min |
| Sat 17 Oct | Maidenhead 13:37 | 0 min | +5 min |
| Sun 11 Oct | Slough 14:02 | +10 min | +16 min |
| Fri 9 Oct | Slough 13:37 | −1 min | +7 min |
| Thu 8 Oct | Slough 13:48 | +11 min | +17 min |
| Wed 7 Oct | Slough 13:49 | +12 min | +12 min |
| Tue 6 Oct | Slough 13:44 | +7 min | +12 min |
| Mon 5 Oct | Slough 13:37 | 0 min | +8 min |
| Sun 4 Oct | 73251 13:33 | −1 min | +5 min |
| Sat 3 Oct | 73251 13:42 | +5 min | +9 min |
| Fri 2 Oct | 73251 13:39 | +2 min | +4 min |
| Thu 1 Oct | 73251 13:50 | +13 min | +15 min |
| Wed 30 Sept | 73251 13:43 | +6 min | +7 min |
| Tue 29 Sept | 73251 13:39 | +2 min | +11 min |
| Mon 28 Sept | 73251 14:04 | +27 min | +31 min |
| Sun 27 Sept | 73251 14:33 | +41 min | +41 min |
| Sat 26 Sept | 73251 13:39 | +2 min | +5 min |
| Fri 25 Sept | 73251 13:45 | +9 min | +19 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.