The Gantoku Line (岩徳線, Gantoku-sen) is a 43.7 km (27.2 mi) railway line operated by West Japan Railway Company (JR West) in western Japan, connecting Iwakuni Station in Iwakuni, Yamaguchi, and Kushigahama Station in Shūnan, Yamaguchi. The line was originally built as a more direct route between its termini than the original Sanyo Main Line (see History section below) and the Sanyo Shinkansen is more closely aligned to this line than the Sanyo Main Line in this section.

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Quick Facts Overview, Native name ...

Gantoku Line
A KiHa 40-2000 DMU
Overview
Native name	岩徳線
Status	In operation
Owner	JR West
Locale	Yamaguchi Prefecture
Termini	Iwakuni Kushigahama
Stations	15
Service
Type	Regional rail
Operator(s)	JR West
Rolling stock	KiHa 40 series DMU
History
Opened	5 April 1929
Technical
Line length	43.7 km (27.2 mi)
Number of tracks	Entire line single tracked
Character	Rural
Track gauge	1,067 mm (3 ft 6 in)
Electrification	None
Operating speed	95 km/h (59 mph)

Close

Trains operating on this line continue from Kushigahama Station to Tokuyama Station on the Sanyo Main Line.

Morigahara Junction (森ヶ原信号場, Morigahara Shingōjō) between Kawanishi and Hashirano Stations is the point where the Nishikigawa Seiryū Line diverges from the Gantoku Line. Between this junction and Kawanishi Station, the two lines share the same track.

The line was originally built to shorten the Sanyo Main Line along the old San'yōdō. The 3.7 km Iwakuni to Marifu (now Nishi-Iwakuni) section opened in 1929, and the 3.9 km Kushigahama to Suo-Hanaoka section opened in 1932. The remaining 36 km section, including the 3,149 m Kinmeiji tunnel (and six others) opened in 1934, at which time the line became part of the Sanyo Main Line, at that time being the only remaining single line section.^{[citation needed]}

In 1944, the original Sanyo alignment via Yanai was double-tracked and reinstated as the Sanyo Main Line, at which time this line became formally known as the Gantoku Line.^{[citation needed]}

Freight services ceased in 1974, and CTC signalling was commissioned on the entire line in 1982.^{[citation needed]}