Govia Thameslink Railway 871R21
View line Govia Thameslink Railway
Alerts for train 871R21
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
93%
26/28 runs under 3 min
RT coverage: 28 full · 0 partial · 0 no data
On-time · 90 days
81%
70/86 runs under 3 min
RT coverage: 86 full · 0 partial · 0 no data
Typical delay
+1min
Median at arrival, 90 days
30 days: 0 min
P90
+4min
9 in 10 runs arrive with less than this
30 days: +2 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 4 Aug Max en route +26 min · last fix heading to 87230 +26 min
- Fri 4 Sept Max en route +14 min · last fix heading to 87230 +14 min
- Fri 14 Aug Max en route +9 min · last fix heading to 87230 +9 min
- Tue 8 Sept Max en route +8 min · last fix heading to 87230 +8 min
- Sun 2 Aug Max en route +8 min · last fix heading to 87230 +8 min
Distribution · 90 days
86 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 14% · 12
- On time 67% · 58
- 3–10 min 16% · 14
- 10–30 min 2% · 2
- 30+ min 0% · 0
On-time by weekday
- 92% M n=12
- 73% T n=11
- 83% W n=12
- 92% T n=13
- 77% F n=13
- 77% S n=13
- 75% S n=12
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Mon 26 Oct | Clapham Jn. C.S. 12:01 | +5 min | +7 min |
| Sun 25 Oct | Clapham Jn. C.S. 11:57 | +1 min | +1 min |
| Sat 24 Oct | Clapham Jn. C.S. 11:56 | −1 min | +2 min |
| Fri 23 Oct | Clapham Jn. C.S. 11:57 | 0 min | +3 min |
| Thu 22 Oct | South Croydon 11:59 | +2 min | +4 min |
| Wed 21 Oct | South Croydon 11:55 | −2 min | — |
| Tue 20 Oct | South Croydon 11:58 | +2 min | +3 min |
| Mon 19 Oct | South Croydon 11:58 | +1 min | +4 min |
| Sun 18 Oct | Redhill 11:35 | 0 min | — |
| Sat 17 Oct | Redhill 11:15 | −1 min | — |
| Fri 16 Oct | South Croydon 11:58 | +1 min | +4 min |
| Thu 15 Oct | Clapham Jn. C.S. 11:55 | −2 min | +1 min |
| Wed 14 Oct | Clapham Jn. C.S. 11:56 | 0 min | +2 min |
| Mon 12 Oct | Clapham Jn. C.S. 11:57 | 0 min | +1 min |
| Sun 11 Oct | — 11:18 | +1 min | +1 min |
| Sat 10 Oct | Clapham Jn. C.S. 11:56 | −1 min | +1 min |
| Fri 9 Oct | Clapham Jn. C.S. 11:57 | −1 min | +2 min |
| Thu 8 Oct | Clapham Jn. C.S. 11:57 | 0 min | +2 min |
| Wed 7 Oct | Clapham Jn. C.S. 11:56 | −1 min | +1 min |
| Tue 6 Oct | Clapham Jn. C.S. 11:58 | +1 min | +3 min |
| Mon 5 Oct | Clapham Jn. C.S. 11:57 | 0 min | +1 min |
| Sun 4 Oct | Redhill 11:18 | −1 min | — |
| Sat 3 Oct | 87230 11:59 | +2 min | +4 min |
| Fri 2 Oct | 87230 11:59 | +2 min | +5 min |
| Thu 1 Oct | 87230 11:58 | +1 min | +3 min |
| Wed 30 Sept | 87230 11:56 | 0 min | +1 min |
| Tue 29 Sept | 87230 12:01 | +4 min | +5 min |
| Sun 27 Sept | Redhill 11:22 | +1 min | +1 min |
| Sat 26 Sept | 87125 15:56 | 0 min | +1 min |
| Fri 25 Sept | 87230 11:55 | −1 min | +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.