Z 9831 Helsinki – Lahti
View line Z
Alerts for train 9831
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line Z.
On-time · 30 days
100%
27/27 runs under 3 min
RT coverage: 27 full · 0 partial · 2 no data
On-time · 90 days
98%
84/86 runs under 3 min
RT coverage: 86 full · 0 partial · 2 no data
Typical delay
−1min
Median at arrival, 90 days
30 days: −1 min
P90
+1min
9 in 10 runs arrive with less than this
30 days: +1 min
Last 30 days
Arrival delay at Lahti, in minutes. One bar per run.
- On time (<3 min)
- 3–10 min
- 10–30 min
- 30+ min
- Partial coverage
- No data
Worst days
- Sun 6 Sept Max en route +6 min · last fix heading to — +6 min
- Tue 21 Jul Max en route +3 min · last fix heading to — +3 min
Distribution · 90 days
86 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 45% · 39
- On time 52% · 45
- 3–10 min 2% · 2
- 10–30 min 0% · 0
- 30+ min 0% · 0
On-time by weekday
- 100% M n=13
- 92% T n=13
- 100% W n=13
- 100% T n=13
- 100% F n=13
- 100% S n=11
- 90% S n=10
Stops and timetable
Timetable of the latest run from the operator’s GTFS (8 stops).
| Stop | Sched. |
|---|---|
| 10:45 | |
| 10:49 / 10:50 | |
| 10:58 / 10:59 | |
| 11:07 / 11:08 | |
| 11:14 / 11:15 | |
| 11:24 / 11:25 | |
| 11:35 / 11:36 | |
| 11:50 |
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.
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Fri 16 Oct | Lahti 12:17 | −2 min | — |
| Thu 15 Oct | Lahti 12:22 | +3 min | +4 min |
| Wed 14 Oct | Lahti 12:20 | −1 min | — |
| Tue 13 Oct | Lahti 12:18 | −2 min | — |
| Mon 12 Oct | Lahti 12:19 | −1 min | — |
| Sun 11 Oct | — 12:21 | No data | — |
| Sat 10 Oct | — 12:21 | No data | — |
| Fri 9 Oct | Lahti 12:20 | +1 min | — |
| Thu 8 Oct | Lahti 12:20 | −1 min | — |
| Wed 7 Oct | Lahti 12:20 | +1 min | — |
| Tue 6 Oct | Lahti 12:21 | −1 min | — |
| Mon 5 Oct | Lahti 12:21 | −1 min | — |
| Sun 4 Oct | Lahti 12:19 | −1 min | — |
| Sat 3 Oct | — 12:21 | 0 min | — |
| Fri 2 Oct | — 14:54 | −1 min | — |
| Thu 1 Oct | — 12:18 | −1 min | — |
| Wed 30 Sept | — 12:19 | −1 min | — |
| Tue 29 Sept | — 12:19 | −2 min | — |
| Mon 28 Sept | — 12:19 | −1 min | — |
| Sun 27 Sept | — 12:19 | −1 min | — |
| Sat 26 Sept | — 11:59 | −2 min | — |
| Fri 25 Sept | — 12:18 | −1 min | — |
| Thu 24 Sept | — 12:20 | 0 min | — |
| Wed 23 Sept | — 12:27 | −1 min | — |
| Tue 22 Sept | — 12:19 | −2 min | — |
| Mon 21 Sept | — 12:19 | −1 min | — |
| Sun 20 Sept | — 12:17 | −2 min | — |
| Sat 19 Sept | — 12:18 | −2 min | — |
| Fri 18 Sept | — 12:21 | +1 min | — |
| Thu 17 Sept | — 12:22 | +1 min | +1 min |