成田スカイアクセス線

Overview

The Narita SKY ACCESS Line (KS) is Keisei's direct road to Narita Airport: 51.4 km from Keisei-Takasago to Narita Airport Terminal 1 in eight stations, opened on 17 July 2010. Its registered name is simply the Narita Airport Line; Keisei signs it by a nickname chosen through a public contest, in orange wherever its Main Line is blue.

Keisei runs every passenger train, yet owns none of the track. The rails belong to four other companies in turn: Hokuso Railway to Komuro, Chiba New Town Railway to Imba-Nihon-idai, Narita Rapid Rail Access over the new line beyond, and Narita Airport Rapid Railway into the terminals. The first 32.3 km is shared with the Hokuso Line, whose own trains keep running on it — and that is why the run has eight names, not eighteen. The ten Hokuso stations in between are Hokuso's alone, not stations of this line, and Keisei's own stop guide draws its orange line straight past them.

The route was first proposed in 1982 and chosen by the government in 1984, then stalled; the airport got its trains in 1991 another way, with JR and Keisei reusing structures built for the abandoned Narita Shinkansen. The Hokuso extension was revived in 1999 and broke ground in 2006. Beyond Imba-Nihon-idai the Skyliner runs at up to 160 km/h, the highest speed in regular service on any Japanese line outside the Shinkansen.

Along the route

Keisei-Takasago is shared ground: Main Line, Sky Access and Hokuso trains use the same platforms. The line crosses the Edo River into Chiba and runs through four Hokuso stations without stopping to Higashi-Matsudo, the interchange with the JR Musashino Line.

Shin-Kamagaya is the only interchange in the city of Kamagaya, where four lines meet: Hokuso, Sky Access, Keisei's Matsudo Line — the Shin-Keisei Line until Keisei absorbed that company in April 2025 — and Tobu's Urban Park Line. From here the Kita-Chiba Road keeps the railway company through Chiba New Town. Chiba New Town Chuo opened in 1984 as the end of the line, next to the planned site of a Narita Shinkansen station that was never built.

Imba-Nihon-idai is where the Hokuso Line ends and only Sky Access trains carry on. It is named for the Nippon Medical School's Chiba Hokusoh Hospital rather than a campus, and its signs add 松虫姫, Princess Matsumushi of local legend. The new line then bridges the waterways of Lake Inba. Narita Yukawa, the one station built for the line and the only one no other line uses, has stickers on the platform floor telling travellers in English, Chinese and Korean that this is not Narita Airport. Just past it the line narrows to single track through a No. 38 turnout about 135 m long, taken by the Skyliner without braking, and runs beside JR's airport branch into the terminals. At both airport stations a fare gate inside the station separates Sky Access passengers from Main Line ones, because the two routes charge different fares.

Why play it

Eight stops and 112 romaji keystrokes: a short run with no easy names, none under 12 keystrokes. The longest, 千葉ニュータウン中央, is signed Chiba Newtown Chuo, but the reading is ちばにゅーたうんちゅうおう, so you type "nyu-taun" with the hyphen key for ー, then "chuuou". 印旛日本医大 sets two traps in a row: the board says Imba, but ん never takes m, and before the い of 医大 it takes nn — "nihonnidai", where a single n is a miss. 新鎌ヶ谷 is written ヶ and read が. 東松戸 voices its 戸 into ど, while 成田湯川 is ゆかわ with no voicing at all. In Kanji mode 空港第2ビル wants the digit 2, and an IME's 第二 will not count. And the last three stops repeat themselves — Narita twice, くうこう twice — just as your hands want to speed up for the finish.