C4b 20521
View line C4b
Alerts for train 20521
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line C4b.
The mini-map returns when the train runs
On-time · 30 days
65%
13/20 runs under 3 min
RT coverage: 20 full · 0 partial · 0 no data
On-time · 90 days
35%
23/65 runs under 3 min
RT coverage: 65 full · 0 partial · 0 no data
Typical delay
+4min
Median at arrival, 90 days
30 days: +2 min
P90
+18min
9 in 10 runs arrive with less than this
30 days: +8 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
- Mon 31 Aug Max en route +46 min · last fix heading to Colmenar Viejo +38 min
- Tue 4 Aug Max en route +35 min · last fix heading to Colmenar Viejo +27 min
- Wed 2 Sept Max en route +25 min · last fix heading to Tres Cantos +25 min
- Thu 13 Aug Max en route +31 min · last fix heading to Colmenar Viejo +22 min
- Wed 12 Aug Max en route +18 min · last fix heading to Madrid-Chamartín-Clara Campoamor +18 min
Distribution · 90 days
65 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 0% · 0
- On time 35% · 23
- 3–10 min 37% · 24
- 10–30 min 26% · 17
- 30+ min 2% · 1
On-time by weekday
- 17% M n=12
- 38% T n=13
- 31% W n=13
- 54% T n=13
- 38% F n=13
- 0% S n=1
- — S n=0
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Fri 9 Oct | Colmenar Viejo 22:20 | +3 min | +9 min |
| Thu 8 Oct | Tres Cantos 22:22 | 0 min | +7 min |
| Wed 7 Oct | Colmenar Viejo 22:18 | +1 min | +6 min |
| Tue 6 Oct | Colmenar Viejo 22:20 | +3 min | +9 min |
| Mon 5 Oct | Colmenar Viejo 22:25 | +8 min | +14 min |
| Fri 2 Oct | Colmenar Viejo 22:24 | 0 min | +9 min |
| Thu 1 Oct | Colmenar Viejo 22:18 | 0 min | +9 min |
| Wed 30 Sept | Colmenar Viejo 22:28 | +8 min | +17 min |
| Tue 29 Sept | Colmenar Viejo 22:22 | +3 min | +11 min |
| Mon 28 Sept | Colmenar Viejo 22:20 | 0 min | +8 min |
| Fri 25 Sept | Colmenar Viejo 22:19 | 0 min | +12 min |
| Thu 24 Sept | Colmenar Viejo 22:21 | +1 min | +10 min |
| Wed 23 Sept | Colmenar Viejo 22:24 | +4 min | +13 min |
| Tue 22 Sept | Colmenar Viejo 22:21 | +2 min | +10 min |
| Mon 21 Sept | Colmenar Viejo 22:26 | +6 min | +14 min |
| Fri 18 Sept | Colmenar Viejo 22:35 | +15 min | +24 min |
| Thu 17 Sept | Colmenar Viejo 22:20 | +1 min | +9 min |
| Wed 16 Sept | Colmenar Viejo 22:20 | 0 min | +8 min |
| Tue 15 Sept | Colmenar Viejo 22:24 | +5 min | +13 min |
| Mon 14 Sept | Colmenar Viejo 22:19 | 0 min | +7 min |
| Fri 11 Sept | Colmenar Viejo 22:22 | +2 min | +10 min |
| Thu 10 Sept | Colmenar Viejo 22:21 | +1 min | +10 min |
| Wed 9 Sept | Colmenar Viejo 22:33 | +13 min | +21 min |
| Tue 8 Sept | Colmenar Viejo 22:19 | 0 min | +9 min |
| Mon 7 Sept | Colmenar Viejo 22:22 | +3 min | +11 min |
| Fri 4 Sept | Colmenar Viejo 22:28 | +8 min | +17 min |
| Thu 3 Sept | Colmenar Viejo 22:26 | +6 min | +14 min |
| Wed 2 Sept | Tres Cantos 22:33 | +25 min | +25 min |
| Tue 1 Sept | Colmenar Viejo 22:20 | 0 min | +8 min |
| Mon 31 Aug | Colmenar Viejo 22:58 | +38 min | +46 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.