Nishi-Oi

Weekday departures: 424/day in the available timetable data · Sat & holiday departures: 160/day in the available timetable data

Earliest / latest departure in the available data (weekday): 4:35 / 24:22 (00:22 next day)

Busiest hour in the available data: 9:00–10:00 (33)

0:00 ─ 23:00

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

Timetable data as of 2 May 2026 to 4 May 2026: the timetables behind these figures were retrieved on different dates.

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:

• Tokaido Main Line: timetable covers only part of the line

• Tokaido Main Line: Shinagawa ⇄ Musashi-Kosugi

Nishi-Ōi Station opened on 2 April 1986, decades after the freight-only Hinkaku Line through Shinagawa Ward had been laid in 1929. The decade-long fight over the station — Japanese National Railways first proposed converting the freight line to passenger use in 1969, residents and the ward council pushed back on the cost-sharing scheme, and a 1980 court even temporarily blocked Shinagawa Ward's contribution — was eventually settled with third-sector funding from 1984. JR East inherited the station with privatisation on 1 April 1987. Shōnan-Shinjuku Line services began stopping on 1 December 2001, and elevated side platforms now sit directly beneath the Tōkaidō Shinkansen viaduct above.

The station sits literally beneath the Tōkaidō Shinkansen — its two elevated side platforms tuck under the viaduct carrying high-speed trains over Shinagawa.