The Aizu Railway Aizu Line (会津鉄道会津線, Aizu Tetsudō Aizu-sen) is a 57.4 km (35.7 mi) long railway line from Nishi-Wakamatsu Station in Aizuwakamatsu to Aizukōgen-Ozeguchi Station in Minamiaizu, Fukushima, Japan. It is owned and operated by Aizu Railway.

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Aizu Line
Aizu Railway AT-150 series DMU at Ashinomaki-Onsen Station, April 2001
Overview
Status	In operation
Owner	Aizu Railway
Locale	Fukushima Prefecture
Termini	Nishi-Wakamatsu Aizukōgen-Ozeguchi
Stations	21
Service
Type	Heavy rail
Operator(s)	Aizu Railway
History
Opened	1 November 1927
Technical
Line length	57.4 km (35.7 mi)
Number of tracks	Entire line single tracked
Character	Rural
Track gauge	1,067 mm (3 ft 6 in)
Electrification	1,500 V DC (Aizu-Tajima — Aizukōgen-Ozeguchi)
Operating speed	85 km/h (53 mph)

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The train operation is controlled from Aizu-Tajima Station. The electrified southern part goes beyond the Aizukōgen-Ozeguchi terminus onto the Yagan Railway Aizu Kinugawa Line, Tobu Railway and JR East all the way to Tokyo. The non-electrified northern part runs a diesel service beyond Nishi-Wakamatsu Station to Aizu-Wakamatsu Station on the JR East Tadami Line.

• All stations are located in Fukushima Prefecture.
• Local trains stop at all stations.
• Stations stopped at by all trains are marked "●".
• Stations stopped at by some of the trains are marked "◆".
• Limited Express train Revaty Aizu^{[note 1]} which goes to and departs from Asakusa Station and does not stop at any stations on the Aizu Line except Aizu-Tajima and Aizukogen-Ozeguchi Station.

• The service called Sightseeing Rapid, Open-car "torokko" Ozatoro Tenbō Ressha ,^[1] is operated by Aizu Railway and/or Yagan Railway. Each separate train stops at different locations depending on its name. For example, Yu-Meguri(湯めぐり), which is operated by Yagan Railway runs from Kinugawaonsen Station to Aizu-Tajima Station. As another example, Aizu Roman (会津浪漫号), which is operated by Aizu Railway runs between Aizu-Tajima Station and Aizu-Wakamatsu Station. Reserving a seat on this train costs 320 yen (adult). You can choose one of three seat types (Tatami and Kotatsu,^{[note 2]} Open Car Truck,^{[note 3]} Dome Car during which there are reclining seats). Passengers may purchase a ticket at stations where staff is present, or they may ask the train crew to sell them a ticket when they board the train.

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The Aizu Line was constructed between 1927 and 1953 by the Japanese National Railways (JNR) as part of a plan to build a direct line from Aizu-Wakamatsu to Tokyo. The Aizu line was the northern section, whilst the Yagan Railway Aizu Kinugawa Line was to be the southern section. Despite the Kinugawa line connecting to the Aizu line in 1986, the Aizu Line was deemed an unprofitable secondary line and transferred to a company established by local governments in 1987.

The Aizukōgen-Ozeguchi - Aizu-Tajima section was electrified at 1500 VDC in 1990 to facilitate through-running onto the Kinugawa line.