Arioka

Weekday departures: 26/day in the available timetable data · Sat & holiday departures: 26/day in the available timetable data

Earliest / latest departure in the available data (weekday): 5:49 / 23:23

Busiest hour in the available data: 19:00–20:00 (4)

0:00 ─ 23:00

Figures are typical departures in the timetable data, not a live service count.

Timetable data as of 2 May 2026.

The timetable data is incomplete for some or all lines at this station, so the weekday and Sat & holiday figures are departures in the available timetable data, not totals.

Lines where the timetable data is incomplete:

• Sukumo Line: only trains from timetable files not linked to this line

• Sukumo Line: Kunimi (Kochi) ⇄ Kogyo-danchi

Arioka Station opened on 1 October 1997 as an intermediate stop on the newly built Tosa Kuroshio Railway Sukumo Line between Nakamura and Sukumo. The station is the only intermediate stop on the Sukumo Line equipped with a passing loop; track 1 is a high-speed through line with no speed limit on entry, while stopping trains preferentially use the entry-side track 2. The unstaffed elevated station has two opposed side platforms in Shimanto, Kōchi Prefecture, with separate staircases serving each platform. Only local trains call there, some continuing east of Nakamura onto the Nakamura Line as far as Kubokawa.

Arioka is the only intermediate station on the Tosa Kuroshio Sukumo Line equipped with a passing loop, and its track 1 is laid out as an unrestricted-speed through line.