Iida Line

, the following train services operate on the Iida Line: The limited express operates two round trips per day between Toyohashi and Iida. The rapid runs one round trip per day between Iida, and (operating a through service on the Chūō Main Line (Tatsuno Branch), Chūō Main Line, Shinonoi Line & Shin'etsu Main Line). Local service frequency changes multiple times along the line. From Toyohashi a 15-minute frequency operates as far as Toyokawa, approximately half-hourly as far as and hourly as far as . Between Hon-Nagashino and Tenryūkyō (a mountainous area with few passengers) services operate every 1-3 hours. North of Tenryūkyō services generally operate approximately hourly, with some sections having 30-minute frequencies in peak times. At Tatsuno, almost all trains continue to/from Okaya on the Chūō Main Line (Tatsuno Branch). Traveling the entire length of the line by local train takes over six hours and generally requires changing trains one or more times. There are only two northbound and three southbound trains per day that operate the entire length of the line between Toyohashi and Tatsuno, with all of them continuing to/from Okaya (one of the southbound trains commences at ). As of 2025, the Iida Line hosts the longest local train service in Japan - the 14:38 train from Toyohashi arrives at Okaya at 21:37 with a running time of 6 hours 59 minutes (419 minutes) for the 96-station journey. ==Stations==

From Toyohashi to Iida :L: :R: :I: All trains stop at stations marked "●" and pass stations marked "-", "↓", or "↑". Arrows indicate the direction of rapid trains. Some trains stop at stops marked "▲". From Iida to Okaya :L: :R: :M: All trains stop at stations marked "●" and pass stations marked "-", "↓", or "↑". Arrows also indicate the directions the rapid trains run. ==Rolling stock==

• 211 series 3-car EMUs (from 15 March 2015, on JR East inter-running services) • 213-5000 series 2-car EMUs • 313-3000 series EMUs • 373 series 3-car EMUs (on Inaji limited express and some all-stations "Local" services) File:Iida-Line JRE-Series211-3000.jpg|A Nagano-based JR East 211 series File:Series213-5000 H13.jpg|A JR Central 2-car 213-5000 series EMU, April 2021 File:Series313-3000 R107.jpg|313-3000 series EMU, April 2021 File:Limited express inaji iida line.JPG|A JR Central 373 series EMU on an Inaji limited express, February 2012 Past rolling stock • 115 series EMUs (until 14 March 2014, on JR East inter-running services) File:Model 115-1000 of JR East.JPG|A Nagano-based JR East 115 series, March 2006 File:JR-central-119-5300.JPG|A JR Central 2-car 119 series EMU, March 2008 ==History==

The Toyokawa Railway opened the section from Toyohashi to Toyokawa in 1897, extending the line to Omi in 1900. At the northern end, the Ina Electric Railway opened the Tatsuno to Ina-Matsushima section (electrified at 1,200 V DC) in 1909, extending the line to Tenryukyo in sections between 1911 and 1927. The Horaitera Railway opened the Omi to Mikawa-Kawai section in 1923, and electrified it at 1,500 V DC in 1925 in conjunction with the electrification of the Toyohashi to Omi section the same year. The Toyohashi to Toyokawa section was double-tracked the following year. The Sanshin Railway opened the Tenryukyo to Kadoshima section as an electrified (1,500 V DC) line in 1932, the Mikawa-Kawai to Toei section (and all subsequent stages) as an electrified line in 1933, and connected the two sections (completing the line) in 1936. All four companies were nationalised in 1943. In 1955, the overhead line voltage of the Tatsuno to Tenryukyo section was increased to 1,500 V DC. CTC signalling was commissioned on the line between 1983 and 1984, and freight services ceased in 1996. Former connecting lines • Hon-Nagashino Station: A 23 km line to Mikawa-Taguchi, electrified at 1,500 V DC, opened between 1930 and 1932. Two 762mm gauge forest railways connected to this line: the Damine forest railway, which connected at the station of the same name, consisted of a 19 km 'main line' (including a tunnel) and a 7 km branch, operated between 1932 and 1960; the Taguchi forest railway connected at the terminus station, consisted of a 10 km 'main line' and a 6 km branch, operated between 1934 and 1963. Both forest railways were notable for initially employing people and "large dogs" to haul the empty wagons upgrade, which then rolled downhill when loaded. The Mikawa-Taguchi line closed following flood damage in 1968. Proposed connecting line • Chubu-Tenryu Station: Construction started on a 35 km line to Tenryu-Futamata on the Hamanako Line in 1967. Proposed to involve 20 bridges and 14 tunnels, about 13 km of roadbed, and about 50% of the overall work had been completed when construction was abandoned in 1980. ==See also==