South Western Railway 821L20
View line South Western Railway
Alerts for train 821L20
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
37%
10/27 runs under 3 min
RT coverage: 27 full · 0 partial · 0 no data
On-time · 90 days
31%
24/78 runs under 3 min
RT coverage: 78 full · 0 partial · 0 no data
Typical delay
+5min
Median at arrival, 90 days
30 days: +6 min
P90
+13min
9 in 10 runs arrive with less than this
30 days: +14 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 22 Aug Max en route +55 min · last fix heading to Farnborough (Main) +43 min
- Wed 4 Nov Max en route +38 min · last fix heading to Clapham Jn. C.S. +38 min
- Tue 11 Aug Max en route +18 min · last fix heading to 87286 +17 min
- Sat 29 Aug Max en route +26 min · last fix heading to 87286 +16 min
- Mon 2 Nov Max en route +15 min · last fix heading to Clapham Jn. C.S. +15 min
Distribution · 90 days
78 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 1% · 1
- On time 29% · 23
- 3–10 min 50% · 39
- 10–30 min 17% · 13
- 30+ min 3% · 2
On-time by weekday
- 38% M n=13
- 15% T n=13
- 15% W n=13
- 8% T n=13
- 42% F n=12
- 58% S n=12
- 100% S n=2
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Thu 5 Nov | Wimbledon 08:52 | +11 min | +11 min |
| Wed 4 Nov | Clapham Jn. C.S. 09:19 | +38 min | +38 min |
| Tue 3 Nov | Wimbledon 08:53 | +12 min | +12 min |
| Mon 2 Nov | Clapham Jn. C.S. 08:54 | +15 min | +15 min |
| Sun 1 Nov | — 04:00 | 0 min | — |
| Sat 31 Oct | Clapham Jn. C.S. 08:56 | −1 min | +3 min |
| Fri 30 Oct | Clapham Jn. C.S. 11:22 | +1 min | +7 min |
| Thu 29 Oct | Clapham Jn. C.S. 09:03 | +14 min | +14 min |
| Wed 28 Oct | Wimbledon 09:03 | +13 min | +13 min |
| Tue 27 Oct | Gillingham (Dorset) 15:07 | 0 min | +2 min |
| Mon 26 Oct | Clapham Jn. C.S. 08:51 | +1 min | +9 min |
| Sat 24 Oct | Clapham Jn. C.S. 08:56 | −1 min | +4 min |
| Fri 23 Oct | Clapham Jn. C.S. 09:02 | +12 min | +12 min |
| Thu 22 Oct | Clapham Jn. C.S. 08:59 | +9 min | +9 min |
| Wed 21 Oct | Wimbledon 08:54 | +4 min | +4 min |
| Tue 20 Oct | Clapham Jn. C.S. 08:57 | +8 min | +8 min |
| Mon 19 Oct | Clapham Jn. C.S. 09:01 | +12 min | +12 min |
| Sat 17 Oct | Clapham Jn. C.S. 08:57 | 0 min | +3 min |
| Fri 16 Oct | Clapham Jn. C.S. 08:52 | +2 min | +2 min |
| Thu 15 Oct | Wimbledon 08:54 | +5 min | +14 min |
| Wed 14 Oct | Clapham Jn. C.S. 09:01 | +12 min | +12 min |
| Tue 13 Oct | Wimbledon 08:55 | +6 min | +6 min |
| Mon 12 Oct | Clapham Jn. C.S. 08:57 | +8 min | +8 min |
| Sun 11 Oct | Gillingham (Dorset) 08:03 | 0 min | +2 min |
| Sat 10 Oct | Gillingham (Dorset) 22:58 | 0 min | — |
| Fri 9 Oct | Clapham Jn. C.S. 08:54 | +5 min | +5 min |
| Thu 8 Oct | Clapham Jn. C.S. 09:05 | +15 min | +15 min |
| Wed 7 Oct | Clapham Jn. C.S. 08:56 | +7 min | +7 min |
| Tue 6 Oct | Clapham Jn. C.S. 08:56 | +7 min | +10 min |
| Mon 5 Oct | 87286 08:51 | +2 min | +8 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.