South Western Railway 871T21
View line South Western Railway
Alerts for train 871T21
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
32%
8/25 runs under 3 min
RT coverage: 25 full · 0 partial · 0 no data
On-time · 90 days
28%
21/76 runs under 3 min
RT coverage: 76 full · 0 partial · 0 no data
Typical delay
+6min
Median at arrival, 90 days
30 days: +7 min
P90
+23min
9 in 10 runs arrive with less than this
30 days: +21 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
- Thu 8 Oct Max en route +66 min · last fix heading to Portsmouth Harbour +66 min
- Thu 13 Aug Max en route +40 min · last fix heading to Portsmouth Harbour +40 min
- Wed 12 Aug Max en route +43 min · last fix heading to Portsmouth Harbour +38 min
- Thu 24 Sept Max en route +48 min · last fix heading to Portsmouth Harbour +37 min
- Tue 27 Oct Max en route +32 min · last fix heading to Portsmouth Harbour +30 min
Distribution · 90 days
76 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 28% · 21
- 3–10 min 34% · 26
- 10–30 min 32% · 24
- 30+ min 7% · 5
On-time by weekday
- 25% M n=12
- 38% T n=13
- 23% W n=13
- 15% T n=13
- 31% F n=13
- 33% S n=12
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Sat 31 Oct | Portsmouth Harbour 11:31 | +4 min | +6 min |
| Fri 30 Oct | Portsmouth & Southsea 11:38 | +12 min | +16 min |
| Thu 29 Oct | Portsmouth Harbour 11:37 | +11 min | +11 min |
| Wed 28 Oct | Portsmouth & Southsea 11:38 | +11 min | +14 min |
| Tue 27 Oct | Portsmouth Harbour 15:19 | +30 min | +32 min |
| Mon 26 Oct | Portsmouth & Southsea 11:49 | +22 min | +24 min |
| Sat 24 Oct | Portsmouth Harbour 11:27 | 0 min | +3 min |
| Fri 23 Oct | Portsmouth Harbour 11:45 | +19 min | +21 min |
| Thu 22 Oct | Portsmouth Harbour 11:28 | +1 min | +2 min |
| Wed 21 Oct | Portsmouth Harbour 11:37 | +11 min | +13 min |
| Tue 20 Oct | Portsmouth Harbour 11:43 | +16 min | +21 min |
| Mon 19 Oct | Portsmouth & Southsea 11:29 | +2 min | +4 min |
| Sat 17 Oct | Portsmouth Harbour 11:29 | +2 min | +4 min |
| Fri 16 Oct | Portsmouth Harbour 14:29 | 0 min | +2 min |
| Thu 15 Oct | Portsmouth Harbour 11:32 | +5 min | +7 min |
| Wed 14 Oct | Portsmouth Harbour 11:35 | +8 min | +9 min |
| Tue 13 Oct | Portsmouth Harbour 11:34 | +7 min | +14 min |
| Mon 12 Oct | Portsmouth Harbour 11:45 | +18 min | +18 min |
| Sat 10 Oct | Portsmouth Harbour 11:31 | +6 min | +8 min |
| Fri 9 Oct | Portsmouth Harbour 11:29 | +2 min | +4 min |
| Thu 8 Oct | Portsmouth Harbour 12:26 | +66 min | +66 min |
| Wed 7 Oct | Portsmouth Harbour 11:27 | 0 min | +2 min |
| Tue 6 Oct | Portsmouth Harbour 11:28 | +2 min | +3 min |
| Mon 5 Oct | Portsmouth & Southsea 14:32 | +9 min | +9 min |
| Sat 3 Oct | 86243 11:01 | +3 min | +5 min |
| Fri 2 Oct | Portsmouth Harbour 11:30 | +3 min | +10 min |
| Thu 1 Oct | Portsmouth Harbour 14:46 | +13 min | +18 min |
| Wed 30 Sept | Portsmouth Harbour 11:42 | +16 min | +16 min |
| Tue 29 Sept | Portsmouth Harbour 11:26 | 0 min | +4 min |
| Mon 28 Sept | Portsmouth Harbour 11:54 | +27 min | +30 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.