The Kōtoku Line (高徳線, Kōtoku-sen) is a railway line in northeastern Shikoku, Japan that connects the prefectural capitals Takamatsu (Kagawa) and Tokushima (Tokushima). Shikoku Railway Company (JR Shikoku) owns and operates the line, whose name comes from the characters in the cities that the line connects: Takamatsu (高松) and Tokushima (徳島).

This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (February 2017)

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Kōtoku Line
A local train traveling over the Kasuga River with Yashima in the background
Overview
Locale	Kagawa, Tokushima prefectures
Termini	Takamatsu Tokushima
Stations	29
Service
Type	Heavy rail
Operator(s)	JR Shikoku
History
Opened	1899
Technical
Line length	74.5 km (46.3 mi)
Track gauge	1,067 mm (3 ft 6 in)
Electrification	None
Operating speed	130 km/h (81 mph)
Route map

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Sanuki, the name of the ancient province that preceded the modern Kagawa Prefecture, appears in the names of four stations on the line.

The Uzushio limited express serves the entire line. Two round-trips per day run through to/from Okayama.

In addition to local trains that run the entire length of the Kōtoku Line, there are trains that run between Takamatsu and Orange Town, Sambommatsu, and Hiketa, as well as between Tokushima and Itano and Tokushima and Hiketa. For a single-tracked line service levels are quite high, except along the prefectural border between Itano and Hiketa. In Tokushima there are through trains to/from the Naruto and Mugi lines, with one train per day running from Takamatsu to Mugi via Anan.

Since the completion of electrification work between Takamatsu and Iyoshi on the Yosan Line, the Kōtoku Line has received some of the newest DMUs on the JR Shikoku network. Local services often use 1000 series, 1200 series and 1500 series DMUs, while limited express services are handled by N2000 series DMUs.

• Local trains stop at all stations. For details of the Uzushio limited express service see that article.
• Trains can pass one another at stations marked "◇" and "^" and cannot pass at those marked "｜".

The first part of what is now the Kotoku Line was built by the Tokushima Railway, being the Sako to Tokushima section of its line from Kamojima (now the Tokushima Line) opened on February 16, 1899. That company was nationalised in 1907.^{[citation needed]} In 1916 the Awa Electric Railway opened a line from Nakahara to Naruto, including the Yoshinari to Ikenotani section, which is now part of the Kotoku Line.^{[citation needed]} The Takamatsu to Hikida section was opened between 1925 and 1928 by the (then) Japanese Imperial Railways.^{[citation needed]}

In 1933 the Awa Electric Railway was nationalised, and in 1935 the Hikida to Ikenotani and Yoshinari to Sako sections were opened, completing the line.

In 1977 CTC signalling became operational for the line, and freight operations ceased in 1986.^{[citation needed]}

With the privatization of JNR, the line became part of the Shikoku Railway Company (JR Shikoku) on April 1, 1987. On June 1, 1988, the line name changed from Kōtoku Main Line to Kōtoku Line.^{[citation needed]}

The elevated Sako Station was commissioned in 1993, and in 1998 track improvement allowing faster speeds was completed, and Orange Town Station opened.^{[citation needed]}

• List of railway lines in Japan