Island Line

Island Line is one of the smaller operators in this archive — 2,588 recorded services from 6 Aug 2026 to 23 Sept 2026, around 53 a day — and it ran 99% of them to within five minutes, ahead of the national figure.

1,803 arrivals were recorded across the window, 1,784 of them within five minutes and 5 more than half an hour late. At this volume a single badly delayed working is worth a visible fraction of a percentage point.

Its week is strongly peaked: 131 services on Sunday, 20 September 2026 against 46 on Sunday, 13 September 2026, a swing of 2.8 times.

Averaged across every recorded arrival its trains finished 0.1 minutes ahead of schedule rather than behind it, the early arrivals outweighing the late ones. The worst single arrival recorded was 1h 25m behind schedule, Ryde Pier Head to Shanklin on Thursday, 3 September 2026.

The day-to-day spread is wide — 29 points between its best day, Wednesday, 23 September 2026 at 100%, and its worst, Thursday, 3 September 2026 at 71%.

70 services were cancelled, 2.7% of everything booked — close to the 2.4% the network cancelled over the same dates. The worst single day was Friday, 4 September 2026, at 94% of that day's timetable.

Counting those cancellations as failures, the way the industry's own measure does, takes the on-time share from 99% of recorded arrivals to 95% of everything booked whose outcome is known — 3.7 points.

Ranked on on-time share of recorded arrivals against the 30 operators with enough of them to compare, Island Line comes first.

Island Line in numbers

Every percentage among the bands is of the 1,803 services whose arrival reached the archive, not of all 2,588, and the bands are exclusive. 715 ran without an arrival being recorded, and nothing is claimed about those. The row counting cancellations is those same 1,784 on-time arrivals over a denominator that also holds the 70 trains that did not run at all. Delay is judged at the destination, a stricter test than the industry's own measure and not comparable with it. The on-time share and the average delay answer different questions.

Day by day

49 archived days, 6 Aug 2026 to 23 Sept 2026, widest bar the busiest, filled to the share that arrived within five minutes. The same days across every operator.

In the daily longest-delay league

Island Line appears 4 times across 49 archived days, on 2 separate dates in the ten shown. These are appearances in the daily league, not this operator's own worst delays.

Recorded live from the Darwin and TRUST feeds on each of the 49 days above, and aggregated here. IL is this operator's ATOC code. How these figures are measured · All operators · Sources and licences