Enshū Railway Line

The line began not as a railway but as a light tramway. On 6 December 1909 the Hamamatsu branch of the Dai-Nippon Kidō company opened a 762 mm narrow-gauge line between Hamamatsu and Kashima. Ownership changed hands as the local operator reorganised: the line was transferred to Enshū Kidō on 12 October 1919, and on 23 August 1921 Enshū Kidō changed its corporate name to Enshū Electric Railway.

A decisive upgrade came in the 1920s. On 1 April 1923 the Hamamatsu–Kashima tramway was abolished and re-opened as a railway under the Local Railway Act, regauged from 762 mm to 1,067 mm and electrified (initially at 600 V DC); removal of the old tram trackage was completed that July. The line was then extended at its city end — a freight section from Enshū-Magome to Enshū-Hamamatsu opened on 1 February 1924, and on 1 September 1927 the line reached Asahimachi, the station later renamed Shin-Hamamatsu that remains the southern terminus today.

The northern terminus and the company itself took their modern form over the following years. On 1 March 1938 Enshū-Futamata Station was relocated and renamed Nishi-Kajima, fixing the line's northern end. On 1 November 1943 the present Enshū Railway was created through the merger of Enshū Electric Railway and five other companies. The line's own name changed repeatedly thereafter: it became the Futamata Densha (Futamata Electric Train) Line on 1 May 1947, the Nishi-Kajima Line on 1 November 1964, and was eventually styled simply the Railway Line.

Through the 1950s and 1960s the line modernised its operations. Express services began on 8 January 1953, and on 1 August that year Asahimachi Station was renamed Shin-Hamamatsu. From 1 November 1958 the railway's diesel railcars began through-running onto the Japanese National Railways Futamata Line, a service extended as far as Enshū-Mori Station on 16 May 1961 before being discontinued on 1 October 1966. On 21 November 1961 the overhead voltage was raised from 600 V to 750 V DC, the level still in use.

Signalling and infrastructure were upgraded from the late 1960s onward. Centralised traffic control was commissioned between Enshū-Hachiman and Nishi-Kajima on 22 December 1967 and extended to cover Shin-Hamamatsu–Enshū-Hachiman on 20 March 1974. Freight operations were abolished on 1 April 1976, when Enshū-Hamamatsu Station was downgraded to a signal box. A major continuous grade-separation project began on 11 December 1980, and on 1 December 1985 an elevated new alignment opened between Shin-Hamamatsu and Entetsu-Hamamatsu; further sections were elevated in October 2011 and November 2012.

In recent decades the Akaden has focused on fare-collection technology and customer service. Synthesised-voice automatic announcements and background music were introduced in April 1979, and the railway moved through a succession of stored-value and IC fare systems, fully rolling out its "Nice Pass" IC card at every station on 20 August 2004. In 2025 it added contactless payment, accepting credit-card touch payments from 1 March and Mastercard from 11 June. Today the line remains a high-frequency, all-stations urban railway threading north through Hamamatsu, its red trains a long-standing fixture of the city.

• 19096 December: the Hamamatsu branch of the Dai-Nippon Kidō company opens the Hamamatsu–Kashima line as a 762 mm narrow-gauge tramway.
• 191912 October: the line is transferred to Enshū Kidō.
• 192123 August: Enshū Kidō changes its corporate name to Enshū Electric Railway.
• 19231 April: the Hamamatsu–Kashima tramway is abolished and re-opened as a railway under the Local Railway Act, regauged to 1,067 mm and electrified (initially 600 V DC).
• 19241 February: the Enshū-Magome–Enshū-Hamamatsu section opens for freight.
• 19271 September: the line is extended from Enshū-Magome to Asahimachi (later renamed Shin-Hamamatsu), the present southern terminus.
• 19381 March: Enshū-Futamata Station is relocated and renamed Nishi-Kajima, the line's present northern terminus.
• 19431 November: the present Enshū Railway is formed by the merger of Enshū Electric Railway and five other companies.
• 19471 May: the line is renamed the Futamata Densha (Futamata Electric Train) Line.
• 19538 January: express services begin; on 1 August, Asahimachi Station is renamed Shin-Hamamatsu.
• 19581 November: the railway's diesel railcars begin through-running onto the JNR Futamata Line (extended to Enshū-Mori on 16 May 1961; discontinued 1 October 1966).
• 196121 November: the overhead voltage is raised from 600 V to 750 V DC.
• 19641 November: the line is renamed the Nishi-Kajima Line.
• 196722 December: centralised traffic control (CTC) is commissioned between Enshū-Hachiman and Nishi-Kajima (extended to Shin-Hamamatsu–Enshū-Hachiman on 20 March 1974).
• 19761 April: freight operations are abolished and Enshū-Hamamatsu Station is downgraded to a signal box.
• 19851 December: an elevated new alignment opens between Shin-Hamamatsu and Entetsu-Hamamatsu (grade-separation works begun 11 December 1980); further sections elevated in October 2011 and November 2012.
• 200420 August: the "Nice Pass" IC card is fully introduced at all stations.
• 20251 March: contactless credit-card touch payment is introduced; from 11 June, Mastercard is accepted.