GWR 851A50
View line GWR
Alerts for train 851A50
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
76%
19/25 runs under 3 min
RT coverage: 25 full · 0 partial · 0 no data
On-time · 90 days
36%
31/85 runs under 3 min
RT coverage: 85 full · 0 partial · 0 no data
Typical delay
+7min
Median at arrival, 90 days
30 days: 0 min
P90
+27min
9 in 10 runs arrive with less than this
30 days: +19 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
- Tue 6 Oct Max en route +101 min · last fix heading to Slough +101 min
- Thu 6 Aug Max en route +84 min · last fix heading to Saltash +84 min
- Wed 12 Aug Max en route +52 min · last fix heading to 84135 +48 min
- Wed 9 Sept Max en route +46 min · last fix heading to 84060 +45 min
- Thu 13 Aug Max en route +57 min · last fix heading to 84060 +43 min
Distribution · 90 days
85 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 9% · 8
- On time 27% · 23
- 3–10 min 21% · 18
- 10–30 min 36% · 31
- 30+ min 6% · 5
On-time by weekday
- 33% M n=12
- 46% T n=13
- 31% W n=13
- 23% T n=13
- 46% F n=13
- 33% S n=9
- 42% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Fri 30 Oct | Slough 05:15 | −1 min | +8 min |
| Thu 29 Oct | West Ealing 05:31 | +19 min | +33 min |
| Wed 28 Oct | West Ealing 05:31 | +19 min | +38 min |
| Tue 27 Oct | West Ealing 05:13 | +1 min | +10 min |
| Mon 26 Oct | Slough 05:29 | +17 min | +42 min |
| Sun 25 Oct | Theale 05:10 | −2 min | +22 min |
| Fri 23 Oct | Slough 05:16 | 0 min | +37 min |
| Thu 22 Oct | Slough 05:13 | +1 min | +16 min |
| Wed 21 Oct | Slough 05:10 | −1 min | +10 min |
| Tue 20 Oct | Slough 05:07 | −4 min | +5 min |
| Mon 19 Oct | Slough 05:06 | −5 min | +6 min |
| Sun 18 Oct | Slough 05:25 | +13 min | +36 min |
| Fri 16 Oct | West Ealing 05:36 | +2 min | +7 min |
| Thu 15 Oct | Slough 05:08 | −4 min | +15 min |
| Wed 14 Oct | West Ealing 05:12 | 0 min | +13 min |
| Tue 13 Oct | West Ealing 05:11 | −1 min | +4 min |
| Mon 12 Oct | West Ealing 05:12 | 0 min | +9 min |
| Sun 11 Oct | Slough 05:12 | 0 min | +13 min |
| Fri 9 Oct | Slough 05:16 | 0 min | +10 min |
| Thu 8 Oct | Maidenhead 05:09 | −3 min | +12 min |
| Wed 7 Oct | Slough 05:09 | −2 min | +9 min |
| Tue 6 Oct | Slough 06:53 | +101 min | +101 min |
| Mon 5 Oct | Slough 05:07 | −6 min | +88 min |
| Sun 4 Oct | 83398 00:51 | +19 min | +20 min |
| Sat 3 Oct | 73251 05:16 | −1 min | +4 min |
| Fri 2 Oct | Exeter St Davids 00:59 | +4 min | +30 min |
| Thu 1 Oct | Teignmouth 00:59 | +18 min | +44 min |
| Wed 30 Sept | Teignmouth 00:59 | +23 min | +23 min |
| Tue 29 Sept | Exeter St Davids 00:59 | +2 min | +44 min |
| Mon 28 Sept | Teignmouth 00:59 | +19 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.