South Western Railway 871A21
View line South Western Railway
Alerts for train 871A21
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line South Western Railway.
The mini-map returns when the train runs
On-time · 30 days
56%
14/25 runs under 3 min
RT coverage: 25 full · 0 partial · 0 no data
On-time · 90 days
49%
41/84 runs under 3 min
RT coverage: 84 full · 0 partial · 0 no data
Typical delay
+3min
Median at arrival, 90 days
30 days: +2 min
P90
+10min
9 in 10 runs arrive with less than this
30 days: +10 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 26 Aug Max en route +40 min · last fix heading to Alton +40 min
- Wed 2 Sept Max en route +24 min · last fix heading to Alton +24 min
- Sat 15 Aug Max en route +24 min · last fix heading to Alton +24 min
- Thu 22 Oct Max en route +21 min · last fix heading to Alton +21 min
- Sun 6 Sept Max en route +21 min · last fix heading to Earlswood (Surrey) +21 min
Distribution · 90 days
84 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 2% · 2
- On time 46% · 39
- 3–10 min 40% · 34
- 10–30 min 10% · 8
- 30+ min 1% · 1
On-time by weekday
- 62% M n=13
- 54% T n=13
- 38% W n=13
- 46% T n=13
- 42% F n=12
- 88% S n=8
- 25% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Thu 29 Oct | Alton 10:50 | +4 min | +5 min |
| Wed 28 Oct | Alton 10:44 | −2 min | +1 min |
| Tue 27 Oct | Alton 10:57 | +10 min | +12 min |
| Mon 26 Oct | Alton 10:50 | +4 min | +5 min |
| Sun 25 Oct | Earlswood (Surrey) 12:03 | +9 min | +9 min |
| Fri 23 Oct | Alton 10:46 | 0 min | +2 min |
| Thu 22 Oct | Alton 11:07 | +21 min | +21 min |
| Wed 21 Oct | Alton 10:47 | +1 min | +3 min |
| Tue 20 Oct | Alton 10:48 | +2 min | +4 min |
| Mon 19 Oct | Alton 10:45 | −1 min | +2 min |
| Sun 18 Oct | New Cross Gate 11:56 | +1 min | +2 min |
| Sat 17 Oct | Alton 11:08 | +1 min | +2 min |
| Fri 16 Oct | Alton 10:46 | 0 min | +2 min |
| Thu 15 Oct | Alton 10:46 | −1 min | +4 min |
| Wed 14 Oct | Alton 10:50 | +4 min | +5 min |
| Tue 13 Oct | Alton 10:53 | +7 min | +7 min |
| Mon 12 Oct | Woking 10:22 | +15 min | +15 min |
| Fri 9 Oct | Alton 10:48 | +2 min | +4 min |
| Thu 8 Oct | Alton 10:49 | +3 min | +4 min |
| Wed 7 Oct | Alton 10:48 | +2 min | +3 min |
| Tue 6 Oct | Alton 10:45 | −1 min | +4 min |
| Mon 5 Oct | Alton 10:45 | −1 min | +4 min |
| Sun 4 Oct | 87230 12:06 | −1 min | +1 min |
| Fri 2 Oct | Alton 10:50 | +3 min | +6 min |
| Thu 1 Oct | Alton 10:53 | +6 min | +7 min |
| Wed 30 Sept | Alton 10:51 | +4 min | +5 min |
| Tue 29 Sept | Alton 10:46 | 0 min | +3 min |
| Mon 28 Sept | Alton 10:46 | −1 min | +5 min |
| Sun 27 Sept | 87230 11:57 | +3 min | +5 min |
| Sat 26 Sept | Alton 10:47 | −19 min | +3 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.