LIRR 421 Jamaica – Port Jefferson
Alerts for train 421
Alerts are saved per line, not per trip id, so they keep working when the operator changes the timetable. This train runs on line LIRR.
Last 30 days
Arrival delay at Port Jefferson, in minutes. One bar per run.
- On time (<3 min)
- 3–10 min
- 10–30 min
- 30+ min
- Partial coverage
- No data
Worst days
- Fri 6 Nov Max en route +42 min · last fix heading to Port Jefferson +41 min
- Tue 6 Oct Max en route +11 min · last fix heading to Port Jefferson +11 min
- Sat 10 Oct Max en route +21 min · last fix heading to Port Jefferson +7 min
- Fri 16 Oct Max en route +9 min · last fix heading to Oyster Bay +7 min
- Wed 28 Oct Max en route +16 min · last fix heading to Port Jefferson +7 min
Distribution · 90 days
29 runs with a known final delay. On time = under 3 min, the same cut the map uses.
- Early 24% · 7
- On time 38% · 11
- 3–10 min 31% · 9
- 10–30 min 3% · 1
- 30+ min 3% · 1
On-time by weekday
- 80% M n=5
- 60% T n=5
- 60% W n=5
- 80% T n=5
- 50% F n=4
- 50% S n=2
- 33% S n=3
Stops and timetable
Timetable of the latest run from the operator’s GTFS (10 stops).
Last 90 days, 29 runs. At intermediate stops it is an estimate from the delay at origin and destination. Delays over 2 h count as “> 2 h”: our data does not measure them exactly.
| Stop | Sched. | Usually | 9 days in 10 |
|---|---|---|---|
| 21:42 | on time | +3 min | |
| 22:05 | ≈ +1 min | ≈ +5 min | |
| 22:24 | ≈ +2 min | ≈ +4 min | |
| 22:29 | ≈ +2 min | ≈ +4 min | |
| 22:34 | ≈ +2 min | ≈ +4 min | |
| 22:41 | ≈ +2 min | ≈ +5 min | |
| 22:49 | ≈ +2 min | ≈ +5 min | |
| 22:55 | ≈ +2 min | ≈ +6 min | |
| 23:01 | ≈ +2 min | ≈ +6 min | |
| 23:13 | +2 min | +7 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 10 July 2026.
Will I make my connection?
Pick where you get off and how many minutes you have until your next train. We work it out from what this train did over the last 90 days.
Include the time to change platforms. It is an estimate from past data, not a guarantee. Days more than 2 h late count as a missed connection.
Recent runs
| Date | Last stop | Final | Max |
|---|---|---|---|
| Fri 6 Nov | Port Jefferson 00:22 | +41 min | +42 min |
| Thu 5 Nov | — 09:23 | 0 min | +1 min |
| Wed 4 Nov | — 09:28 | +2 min | +4 min |
| Tue 3 Nov | — 09:29 | −3 min | +1 min |
| Mon 2 Nov | — 09:30 | 0 min | +4 min |
| Thu 29 Oct | Oyster Bay 19:23 | +2 min | +5 min |
| Wed 28 Oct | Port Jefferson 21:00 | +7 min | +16 min |
| Tue 27 Oct | Speonk 01:06 | 0 min | +7 min |
| Mon 26 Oct | Port Jefferson 19:30 | +6 min | +8 min |
| Fri 23 Oct | Port Jefferson 00:59 | +2 min | +8 min |
| Thu 22 Oct | Port Jefferson 00:59 | +2 min | +7 min |
| Wed 21 Oct | Port Jefferson 21:39 | +2 min | +4 min |
| Tue 20 Oct | Port Jefferson 18:33 | 0 min | +9 min |
| Mon 19 Oct | Patchogue 23:40 | +3 min | +9 min |
| Sun 18 Oct | Patchogue 18:48 | +4 min | +8 min |
| Sat 17 Oct | Speonk 01:15 | −2 min | +7 min |
| Fri 16 Oct | Oyster Bay 20:17 | +7 min | +9 min |
| Thu 15 Oct | Montauk 22:01 | −2 min | +7 min |
| Wed 14 Oct | Port Jefferson 23:41 | −2 min | +37 min |
| Tue 13 Oct | Patchogue 19:43 | +6 min | +18 min |
| Mon 12 Oct | Oyster Bay 17:46 | −2 min | +3 min |
| Sun 11 Oct | Port Jefferson 01:13 | +5 min | +8 min |
| Sat 10 Oct | Port Jefferson 01:12 | +7 min | +21 min |
| Fri 9 Oct | Port Jefferson 23:44 | −3 min | +8 min |
| Thu 8 Oct | Bay Shore 18:47 | +4 min | +5 min |
| Wed 7 Oct | Port Jefferson 22:46 | +4 min | +6 min |
| Tue 6 Oct | Port Jefferson 21:11 | +11 min | +11 min |
| Mon 5 Oct | Speonk 02:00 | +3 min | +9 min |
| Sun 4 Oct | 154 01:12 | −2 min | +1 min |
| Fri 2 Oct | 90505 00:12 | No data | — |