South Western Railway 871A20
View line South Western Railway
Alerts for train 871A20
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
21%
6/28 runs under 3 min
RT coverage: 28 full · 0 partial · 0 no data
On-time · 90 days
38%
33/86 runs under 3 min
RT coverage: 86 full · 0 partial · 0 no data
Typical delay
+3min
Median at arrival, 90 days
30 days: +7 min
P90
+13min
9 in 10 runs arrive with less than this
30 days: +16 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 27 Oct Max en route +27 min · last fix heading to Clapham Jn. C.S. +27 min
- Sun 13 Sept Max en route +25 min · last fix heading to Brighton +23 min
- Sat 31 Oct Max en route +19 min · last fix heading to Clapham Jn. C.S. +19 min
- Thu 8 Oct Max en route +18 min · last fix heading to Clapham Jn. C.S. +18 min
- Wed 28 Oct Max en route +15 min · last fix heading to Wimbledon +15 min
Distribution · 90 days
86 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 1% · 1
- On time 37% · 32
- 3–10 min 48% · 41
- 10–30 min 14% · 12
- 30+ min 0% · 0
On-time by weekday
- 50% M n=12
- 8% T n=13
- 38% W n=13
- 23% T n=13
- 45% F n=11
- 67% S n=12
- 42% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Thu 5 Nov | Clapham Jn. C.S. 09:03 | +14 min | +14 min |
| Wed 4 Nov | Clapham Jn. C.S. 08:49 | +2 min | +4 min |
| Tue 3 Nov | Wimbledon 08:54 | +7 min | +7 min |
| Mon 2 Nov | Clapham Jn. C.S. 09:02 | +14 min | +14 min |
| Sun 1 Nov | Brighton 13:32 | +7 min | +9 min |
| Sat 31 Oct | Clapham Jn. C.S. 09:38 | +19 min | +19 min |
| Fri 30 Oct | Clapham Jn. C.S. 09:03 | +6 min | +6 min |
| Thu 29 Oct | Clapham Jn. C.S. 09:10 | +13 min | +13 min |
| Wed 28 Oct | Wimbledon 09:12 | +15 min | +15 min |
| Tue 27 Oct | Clapham Jn. C.S. 09:24 | +27 min | +27 min |
| Mon 26 Oct | Clapham Jn. C.S. 09:03 | +6 min | +6 min |
| Sun 25 Oct | Brighton 13:23 | +8 min | +8 min |
| Sat 24 Oct | Clapham Jn. C.S. 09:18 | 0 min | +4 min |
| Fri 23 Oct | Clapham Jn. C.S. 08:56 | −1 min | +2 min |
| Thu 22 Oct | Clapham Jn. C.S. 09:05 | +8 min | +8 min |
| Wed 21 Oct | Clapham Jn. C.S. 08:57 | 0 min | +2 min |
| Tue 20 Oct | Clapham Jn. C.S. 09:08 | +10 min | +10 min |
| Mon 19 Oct | Clapham Jn. C.S. 09:06 | +9 min | +9 min |
| Sun 18 Oct | Preston Park 13:13 | −1 min | +2 min |
| Sat 17 Oct | Clapham Jn. C.S. 09:06 | 0 min | +1 min |
| Fri 16 Oct | Clapham Jn. C.S. 09:06 | +9 min | +9 min |
| Thu 15 Oct | Clapham Jn. C.S. 09:01 | +4 min | +4 min |
| Wed 14 Oct | Clapham Jn. C.S. 09:08 | +11 min | +11 min |
| Tue 13 Oct | Wimbledon 09:02 | +5 min | +5 min |
| Mon 12 Oct | Clapham Jn. C.S. 09:03 | +6 min | +6 min |
| Sat 10 Oct | Clapham Jn. C.S. 09:26 | +7 min | +7 min |
| Fri 9 Oct | Wimbledon 09:00 | +3 min | +3 min |
| Thu 8 Oct | Clapham Jn. C.S. 09:15 | +18 min | +18 min |
| Wed 7 Oct | Clapham Jn. C.S. 09:04 | +7 min | +7 min |
| Tue 6 Oct | Clapham Jn. C.S. 09:00 | +3 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.