Govia Thameslink Railway 871P21
View line Govia Thameslink Railway
Alerts for train 871P21
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line Govia Thameslink Railway.
The mini-map returns when the train runs
On-time · 30 days
68%
19/28 runs under 3 min
RT coverage: 28 full · 0 partial · 0 no data
On-time · 90 days
73%
63/86 runs under 3 min
RT coverage: 86 full · 0 partial · 0 no data
Typical delay
0min
Median at arrival, 90 days
30 days: 0 min
P90
+14min
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
- Wed 23 Sept Max en route +77 min · last fix heading to Kenley +77 min
- Mon 7 Sept Max en route +30 min · last fix heading to Portsmouth Harbour +30 min
- Wed 21 Oct Max en route +20 min · last fix heading to Portsmouth Harbour +20 min
- Mon 12 Oct Max en route +16 min · last fix heading to Caterham +16 min
- Fri 14 Aug Max en route +17 min · last fix heading to Portsmouth Harbour +16 min
Distribution · 90 days
86 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 3% · 3
- On time 70% · 60
- 3–10 min 12% · 10
- 10–30 min 13% · 11
- 30+ min 2% · 2
On-time by weekday
- 67% M n=12
- 75% T n=12
- 54% W n=13
- 62% T n=13
- 77% F n=13
- 100% S n=13
- 80% S n=10
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Sun 25 Oct | Caterham 13:02 | −1 min | +1 min |
| Sat 24 Oct | Caterham 11:05 | 0 min | +3 min |
| Fri 23 Oct | Caterham 11:05 | 0 min | +3 min |
| Thu 22 Oct | Portsmouth Harbour 11:05 | −1 min | +5 min |
| Wed 21 Oct | Portsmouth Harbour 11:16 | +20 min | +20 min |
| Tue 20 Oct | Whyteleafe 11:07 | +1 min | +5 min |
| Mon 19 Oct | Caterham 11:05 | −1 min | +2 min |
| Sun 18 Oct | Portsmouth Harbour 14:37 | +1 min | +2 min |
| Sat 17 Oct | Portsmouth Harbour 11:04 | −1 min | +13 min |
| Fri 16 Oct | Caterham 11:21 | +15 min | +19 min |
| Thu 15 Oct | Caterham 11:07 | +2 min | +10 min |
| Wed 14 Oct | Whyteleafe 11:09 | +3 min | +6 min |
| Tue 13 Oct | Portsmouth & Southsea 11:08 | +11 min | +11 min |
| Mon 12 Oct | Caterham 11:12 | +16 min | +16 min |
| Sun 11 Oct | Caterham 13:02 | −2 min | +1 min |
| Sat 10 Oct | Caterham 11:07 | +1 min | +3 min |
| Fri 9 Oct | Caterham 11:06 | 0 min | +3 min |
| Thu 8 Oct | Caterham 11:08 | +12 min | +12 min |
| Wed 7 Oct | Whyteleafe 11:11 | +5 min | +9 min |
| Tue 6 Oct | Caterham 11:05 | −1 min | +3 min |
| Mon 5 Oct | Caterham 11:05 | −1 min | +3 min |
| Sun 4 Oct | Caterham 13:08 | +4 min | +9 min |
| Sat 3 Oct | Caterham 11:05 | −1 min | +4 min |
| Fri 2 Oct | Caterham 11:05 | 0 min | +6 min |
| Thu 1 Oct | Portsmouth Harbour 11:09 | +13 min | +13 min |
| Wed 30 Sept | Caterham 11:05 | 0 min | +5 min |
| Tue 29 Sept | Caterham 11:05 | −1 min | +3 min |
| Mon 28 Sept | Caterham 11:05 | 0 min | +5 min |
| Sat 26 Sept | Caterham 11:05 | −1 min | +4 min |
| Fri 25 Sept | Portsmouth Harbour 11:05 | +8 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.