Shibayama Railway Line

The line exists chiefly for political and social reasons rather than commercial ones. The expansion of Narita International Airport cut the town of Shibayama and the area immediately east of the airport off from Narita City and points west, and a rail link was strongly demanded by Shibayama residents, the Transport Ministry and the airport authority as a way to compensate the surrounding community. The Shibayama Railway Company was founded on 1 May 1981 to build that link, and on 24 June 1988 it received an operating permit for a planned 2.0-kilometre line between a then-unnamed southern station and a station beside the airport.

Early plans called only for small trains running within the short line, but in 1990, responding to residents' demands, the company applied to use full-size trains and the permit was granted just two days later. In the same year the company applied to run through services to Keisei Narita Station by way of Higashi-Narita — the former airport station to which its northern terminus would connect — and that application was approved in 1996. Around the same period the Keisei Electric Railway repurposed unused structures from the abandoned Narita Shinkansen project to reach the airport terminal, which turned the old line to the former Narita Airport Station, by then renamed Higashi-Narita, into the separate Keisei Higashi-Narita Line.

Construction of the Shibayama line began in 1998. In 2000 the planned route had to be lengthened by a further 0.2 kilometre because of difficulties acquiring land — a legacy of the long-running Sanrizuka anti-airport struggle — and in the same year the southern terminus, which had carried only a placeholder name, was given the name Shibayama-Chiyoda. The line finally opened on 27 October 2002. (The line's own infobox on English Wikipedia gives the opening as 22 October, but the article text, the Japanese article and a contemporaneous Chiba Nippo newspaper report all give 27 October, the date followed here.)

From the outset the Shibayama Railway operated as a seamless extension of the Keisei network rather than as a self-contained railway. It has no train crews of its own; driving is entrusted to Keisei, whose crews stay aboard through Higashi-Narita without a change, and the rolling stock is leased from Keisei as well. Every train runs through onto the Keisei Higashi-Narita Line, typically continuing to Keisei Narita, and at peak times services run through farther still over the Keisei, Toei Asakusa and Keikyū networks. Uniquely among lines that through-run with Keisei, the Shibayama line does not accept PASMO, Suica or other IC cards.

Because the whole line lies on or beside airport land, it has long had an unusual security character: uniformed police of the Chiba Prefectural Police airport security unit once rode the trains as a matter of routine, though that on-board policing has since been replaced by ordinary guards. The alignment also bears the mark of the airport conflict in a more physical way — between Higashi-Narita and Shibayama-Chiyoda the track curves sharply, on a radius of 160 metres, to skirt the "Kinone Pension," a parcel held by airport opponents, and trains slow to 35 km/h there, lengthening the run by about a minute over what was originally planned.

The line opened in 2002 using eight-car Keisei 3600 series trains leased from Keisei, but because those sets could not run onto the Keikyū line they spent most of their time away from the Shibayama line itself; on 1 April 2013 they were replaced by a four-car Keisei 3500 series set. In 2022 that train's livery was changed to the red-and-green scheme of the company logo, and from 26 November 2022 driver-only operation began on the daytime four-car services. Proposals to extend the line deeper into Shibayama town and toward the Kujūkuri coast have been floated but have not advanced, and a shuttle bus to the coast runs as an interim measure; the Shibayama Railway Line therefore remains, as it began, Japan's shortest single-operator railway.

• 19811 May: the Shibayama Railway Company is founded to build a rail link compensating the community east of Narita Airport.
• 198824 June: the company receives an operating permit for a planned 2.0 km line between the (then-unnamed) southern station and a station beside the airport.
• 1990Responding to residents' demands, the company applies to use full-size trains (the permit is granted two days later) and applies to run through service to Keisei Narita via Higashi-Narita.
• 1996The application to run through service to Keisei Narita Station is approved.
• 1998Construction of the line begins.
• 2000The planned route is lengthened by a further 0.2 km because of land-acquisition difficulties (the Sanrizuka struggle); the southern terminus is named Shibayama-Chiyoda.
• 200227 October: the Shibayama Railway Line opens between Higashi-Narita and Shibayama-Chiyoda, operating with eight-car Keisei 3600 series trains leased from Keisei.
• 20131 April: the leased rolling stock changes from the eight-car Keisei 3600 series (used since the 2002 opening) to a four-car Keisei 3500 series set.
• 2022The 3500 series livery is changed to the company's red-and-green logo colours; from 26 November, driver-only (one-man) operation begins on daytime four-car services.