Kaigan Line

The line grew out of plans to serve the densely built coastal belt of central and western Kobe, an area not directly reached by the existing Seishin-Yamate Line. The Kobe City Transportation Bureau applied for a Category 1 railway business licence for a Shin-Nagata–Sannomiya route on 16 February 1993 and obtained it on 26 April 1993. The city-planning decision followed on 7 January 1994, and construction work began on 29 March 1994 in the Wadamisaki work section, with a ground-breaking ceremony held on 19 April 1994; the line was at that point scheduled for completion in early 1999.

That timetable was overturned by disaster. On 17 January 1995 the Great Hanshin earthquake struck Kobe, and construction of the line was suspended. Work resumed on 9 May 1995, but the interruption, together with the wider reconstruction of the city, pushed the opening date back by more than two years.

To hold down construction cost and tunnel size beneath the crowded streets of Kobe, the line was built as a small-profile "mini-subway" driven by a linear motor — the third iron-wheel linear-motor rapid-transit line to be built in Japan, after similar systems in Osaka and Tokyo. The linear-motor design allowed smaller-bore tunnels and tighter curves and gradients than a conventional subway, at the price of bespoke rolling stock; the line is worked by purpose-built 5000-series trains based at the Misaki-Kōen depot.

Construction reached its main milestones at the turn of the millennium. The tunnelling was completed and the whole line bored through on 14 February 2000, the final station names were fixed on 28 February 2000, and the nickname "Yumekamome" was chosen in July 2000. After a rail-fastening ceremony on 10 August 2000, test running began on the Shin-Nagata–Misaki-Kōen section on 22 August 2000 and was extended over the whole line on 15 November 2000, followed by familiarisation running from 1 February 2001 and a public preview ride on 17 June 2001. After an opening ceremony on 6 July 2001, the Kaigan Line entered revenue service on 7 July 2001.

From the outset the line carried far fewer passengers than had been forecast. Pre-opening projections had anticipated about 80,000 boardings a day in fiscal 2001 rising to 130,000 by fiscal 2005, but the actual figures came in at only 34,446 in fiscal 2001, 39,004 in fiscal 2005 and 42,396 in fiscal 2011 — barely a third of the original estimate. Ridership recovered to a daily average of about 51,400 in fiscal 2019 before falling back to roughly 42,000 in fiscal 2020 amid the wider downturn in travel.

The weak patronage left the line in chronic deficit. Across its first two decades it never once turned an annual operating profit, and by fiscal 2020 it had run up an accumulated deficit of about 106.9 billion yen. The line did not record its first running surplus until the fiscal 2024 accounts. Even with that improvement, the Kaigan Line is frequently cited as a cautionary example of an urban subway whose construction cost and capacity ran well ahead of the demand it ultimately attracted.

• 199316 February: the Kobe City Transportation Bureau applies for a Category 1 railway business licence for the Shin-Nagata–Sannomiya route; the licence is granted on 26 April.
• 19947 January: the city-planning decision is made; construction begins on 29 March in the Wadamisaki work section, with a ground-breaking ceremony on 19 April. Completion is then scheduled for 1999.
• 199517 January: the Great Hanshin earthquake strikes Kobe and construction of the line is suspended; work resumes on 9 May.
• 200014 February: tunnelling is completed and the whole line is bored through; final station names are fixed on 28 February; the nickname 'Yumekamome' is chosen in July; after a rail-fastening ceremony on 10 August, test running begins on the Shin-Nagata–Misaki-Kōen section on 22 August and is extended over the whole line on 15 November.
• 20011 February: familiarisation running begins; a public preview ride is held on 17 June; after an opening ceremony on 6 July, the Kaigan Line opens for revenue service on 7 July as the second line of the Kobe Municipal Subway.
• 2001Fiscal 2001 ridership is just 34,446 boardings a day, against a pre-opening forecast of about 80,000.
• 200216 December: all-day women-only cars are introduced (simultaneously with the Seishin-Yamate Line).
• 2005Fiscal 2005 ridership reaches 39,004 boardings a day, far short of the 130,000 once projected for that year.
• 2011Fiscal 2011 ridership stands at 42,396 boardings a day, still only about a third of the original estimate.
• 2019Fiscal 2019 ridership recovers to a daily average of about 51,400 boardings, the line's strongest figure.
• 2020Fiscal 2020 ridership falls back to a daily average of about 42,000 boardings; by this point the line has accumulated a deficit of about 106.9 billion yen and has never once turned an annual operating profit.
• 2024The fiscal 2024 accounts record the line's first-ever annual running surplus.