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
30%
8/27 runs under 3 min
RT coverage: 27 full · 0 partial · 0 no data
On-time · 90 days
28%
17/60 runs under 3 min
RT coverage: 60 full · 0 partial · 0 no data
Typical delay
+5min
Median at arrival, 90 days
30 days: +5 min
P90
+11min
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
- Sat 22 Aug Max en route +55 min · last fix heading to Farnborough (Main) +43 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
- Thu 8 Oct Max en route +15 min · last fix heading to Clapham Jn. C.S. +15 min
- Mon 7 Sept Max en route +14 min · last fix heading to 87286 +14 min
Distribution · 90 days
60 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 2% · 1
- On time 27% · 16
- 3–10 min 60% · 36
- 10–30 min 10% · 6
- 30+ min 2% · 1
On-time by weekday
- 40% M n=10
- 10% T n=10
- 20% W n=10
- 10% T n=10
- 40% F n=10
- 44% S n=9
- 100% S n=1
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| 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 |
| Sat 3 Oct | 87286 09:00 | +3 min | +9 min |
| Fri 2 Oct | 87286 08:50 | +1 min | +2 min |
| Thu 1 Oct | 87286 08:57 | +8 min | +8 min |
| Wed 30 Sept | 87286 09:00 | +11 min | +11 min |
| Tue 29 Sept | 87286 08:54 | +5 min | +6 min |
| Mon 28 Sept | 87286 08:51 | +2 min | +4 min |
| Sat 26 Sept | 87286 08:56 | −1 min | +2 min |
| Fri 25 Sept | 87286 08:53 | +4 min | +4 min |
| Thu 24 Sept | 87286 08:54 | +5 min | +5 min |
| Wed 23 Sept | 87286 08:52 | +2 min | +3 min |
| Tue 22 Sept | 87286 08:56 | +7 min | +7 min |
| Mon 21 Sept | Farnborough (Main) 08:10 | +3 min | +3 min |
| Sat 19 Sept | 87215 09:37 | +9 min | +9 min |
| Fri 18 Sept | 87286 08:53 | +4 min | +4 min |
| Thu 17 Sept | 87286 08:54 | +5 min | +5 min |
| Wed 16 Sept | 87286 08:53 | +4 min | +4 min |
| Tue 15 Sept | 87286 08:56 | +7 min | +7 min |
| Mon 14 Sept | Gillingham (Dorset) 12:00 | −1 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.