Keikyu Zushi Line

The line was opened on 1 April 1930 by the Shōnan Electric Railway as the section between Kanazawa-hakkei and Shōnan-Zushi, laid to standard gauge. On 1 April 1931 Jimmuji Station opened, the line was extended by 0.4 km, and a Hayama-guchi (Hayama-side) boarding point was added at Shōnan-Zushi while the original stop became the Numama-guchi boarding point. The line was absorbed into the Keihin Electric Railway on 1 November 1941, and on 1 May 1942 Keihin in turn merged into Tokyu — the so-called "Greater Tokyu" — making the route part of the Tokyu Shōnan Line.

On 1 September 1942 the Hayama-guchi boarding point was closed and the line was cut back to the Numama-guchi stop, which was renamed Shōnan-Zushi. In 1943 a temporary station, Mutsuura-shō, opened on 15 February for naval personnel between Kanazawa-hakkei and Jimmuji, and on 15 October the Kanazawa-hakkei–Shōnan-Zushi stretch was reduced to a single track. Jimmuji Station was moved to its present site on 1 September 1944.

After the war the line passed to Keikyū, when Keihin Electric Express Railway was separated out of Tokyu on 1 June 1948. In the same year the old Hayama-guchi boarding point was revived as Zushi-Kaigan Station on 3 July, the Kanazawa-hakkei–Jimmuji section was re-doubled on 16 August, and through running between Yokohama and Zushi-Kaigan began on 6 September. On 1 March 1949 the wartime temporary stop was relocated and reopened as the present Mutsuura Station, and on 10 July through running between Shinagawa and Zushi-Kaigan began.

The line's two stations at the Zushi end were eventually consolidated. Shōnan-Zushi was renamed Keihin-Zushi on 1 November 1963, and on 2 March 1985 Keihin-Zushi and Zushi-Kaigan were merged into a single new station, Shin-Zushi, built at the midpoint between them; this shortened the line by 0.2 km to its present length of 5.9 km. The present limited-express (tokkyū) service was introduced on 31 July 1999 (limited expresses had run on the line before, from 1952 until 1974, and in summer only until 1976). The safety system was upgraded to C-ATS on 14 February 2009, and on 16 May 2010 the Airport Express was introduced, calling at every station on the line.

The Zushi Line has a distinctive operational feature: part of it is laid with dual-gauge (three-rail) track. Because the Sōgō Sharyō (J-TREC) Yokohama plant — the former Tokyu Car Corporation works — sits beside the Keikyū Main Line near Kanazawa-hakkei, rolling stock entering and leaving the plant is moved over the Zushi Line's three-rail section to and from Zushi Station on the JR Yokosuka Line. This lets 1,067 mm narrow-gauge rolling stock leave the plant for JR tracks, while Keikyū cars built by Kawasaki Railcar, cars built by Nippon Sharyō for Keikyū's through-service partners such as Keisei Electric Railway and Hokusō Railway, and vehicles due for modification at the plant arrive from the JR side by the same route.

Station numbering was introduced on 21 October 2010, and since that date the 2.8 km between Mutsuura and Jimmuji has been the longest interval between adjacent stations anywhere on the Keikyū network. The terminus, Shin-Zushi, was renamed Zushi·Hayama on 14 March 2020, and from 25 November 2023 the line's Airport Express services were redesignated simply as Express. Zushi·Hayama serves as the gateway for visitors to the town of Hayama, which has marine resorts as well as villa areas that include the Hayama Imperial Villa. Hayama itself has no railway station, so visitors reach it from Zushi·Hayama by Keihin Kyūkō bus, among other means, and Keikyū markets discount excursion tickets such as the "Hayama Joshi-tabi" pass for the trip. All trains stop at all four of the line's stations.

4 stations tracked on the map, listed alphabetically. Select any to read its page.

• Jimmuji神武寺
• Kanazawa-Hakkei金沢八景
• Mutsuura六浦
• Zushi-Hayama逗子・葉山

• 19301 April: the Shōnan Electric Railway opens the line between Kanazawa-hakkei and Shōnan-Zushi, built to 1,435 mm standard gauge.
• 19311 April: Jimmuji Station opens; the line is extended 0.4 km and a Hayama-guchi boarding point is added at Shōnan-Zushi, the original stop becoming the Numama-guchi boarding point.
• 19411 November: the line is absorbed into the Keihin Electric Railway.
• 19421 May: Keihin Electric Railway merges into Tokyu (the 'Greater Tokyu'), and the route becomes part of the Tokyu Shōnan Line; on 1 September the Hayama-guchi point is closed and the line is cut back to Numama-guchi, renamed Shōnan-Zushi.
• 194315 February: the temporary Mutsuura-shō Station opens for naval personnel between Kanazawa-hakkei and Jimmuji; 15 October: the Kanazawa-hakkei–Shōnan-Zushi section is single-tracked.
• 19441 September: Jimmuji Station is relocated to its present site.
• 19481 June: Keihin Electric Express Railway (Keikyū) is separated from Tokyu; the Hayama-guchi boarding point is revived as Zushi-Kaigan Station (3 July), Kanazawa-hakkei–Jimmuji is re-doubled (16 August), and Yokohama–Zushi-Kaigan through service begins (6 September).
• 19491 March: the temporary Mutsuura-shō Station is relocated and reopens as the present Mutsuura Station; 10 July: through service begins between Shinagawa and Zushi-Kaigan.
• 19631 November: Shōnan-Zushi Station is renamed Keihin-Zushi.
• 19852 March: Keihin-Zushi and Zushi-Kaigan stations are merged into a new Shin-Zushi Station at the midpoint between them; the line is shortened by 0.2 km to its present 5.9 km.
• 199931 July: with a timetable revision, the present limited-express (tokkyū) service begins on the line (three weekday-morning round trips only); limited expresses had previously run on the line from 1952 until 1974 (in summer only until 1976).
• 200914 February: the line's safety system is upgraded to C-ATS.
• 201016 May: an Airport Express begins running, calling at every station on the line; 21 October: station numbering is introduced.
• 202014 March: Shin-Zushi Station is renamed Zushi·Hayama.
• 202325 November: the line's Airport Express services are redesignated simply as Express.