Ainokaze Toyama Railway Line

The corridor's origins lie with the government railway that pushed north along the Sea of Japan coast at the close of the nineteenth century. On 1 November 1898 the state Hokuriku Line was extended from Kanazawa to Takaoka, a distance recorded at 25 miles 29 chains (about 40.82 km). The following spring, on 20 March 1899, the line reached Toyama with the opening of the Takaoka–Toyama section (11 miles 5 chains, about 17.8 km), at which time Kosugi and Toyama stations opened.

The railway then continued eastward through Toyama Prefecture. On 16 November 1908 the route between Kureha and Toyama was realigned and Toyama Station was relocated, and the Toyama Line opened onward from Toyama to Uozu (15.8 miles, about 25.43 km); Kureha Station had opened a fortnight earlier on 3 November 1908. On 15 June 1909 the Kurikara signal station was upgraded to Kurikara Station, the line's present western terminus.

On 12 October 1909 the government formally designated the Maibara–Uozu route, together with the Tsuruga–Kanagasaki section, as the Hokuriku Main Line, bringing the Toyama segment under that trunk-line name. Construction toward the prefectural border continued: the Uozu–Tomari section (14.7 miles, about 23.66 km) opened on 16 April 1910, and on 15 October 1912 the Tomari–Ōmi section (14.5 miles, about 23.34 km) opened, at which point Ichiburi Station — the line's present eastern terminus, just inside Niigata Prefecture — came into service.

For most of the twentieth century the line operated as part of the Hokuriku Main Line under the Japanese National Railways. Electrification with alternating current was carried out in the mid-1960s: the Kanazawa–Toyama marshalling-yard section was electrified on 24 August 1964, the marshalling yard to Tomari on 25 August 1965, and Tomari to Ichiburi (continuing to Itoigawa) on 30 September 1965. Double-tracking and electrification of the whole line were completed on 1 October 1969. The line passed to West Japan Railway Company (JR West) in 1987 with the breakup and privatisation of JNR.

The decisive change came with the Hokuriku Shinkansen. On 14 March 2015 the high-speed line was extended from Nagano to Kanazawa, and on the same day JR West discontinued the conventional Kanazawa–Naoetsu route (177.2 km) as a JR line. Of that stretch, the Kurikara–Ichiburi section (100.1 km) within Toyama Prefecture was transferred to the newly created Ainokaze Toyama Railway and renamed the Ainokaze Toyama Railway Line, while the remaining sections passed to other third-sector operators. JR Freight retained access across the whole line as a Type 2 operator, keeping the corridor in use for freight between the Kansai region and northern Honshū.

The new operator quickly added its own services. On 16 March 2015 it launched the "Ainokaze Liner," a limited-stop, all-reserved commuter service running on weekday mornings and evenings between Kanazawa and Toyama or Tomari, for which a supplementary liner charge is payable in addition to the ordinary fare. Today the line carries local and Ainokaze Liner passenger trains together with through services that continue beyond its ends onto neighbouring third-sector and JR lines, alongside the heavy JR Freight traffic of the Japan Sea corridor.

• 18981 November: the government Hokuriku Line is extended from Kanazawa to Takaoka (about 40.82 km).
• 189920 March: the Takaoka–Toyama section (about 17.8 km) opens; Kosugi and Toyama stations open.
• 190816 November: the Kureha–Toyama route is realigned and Toyama Station relocated; the Toyama Line opens onward from Toyama to Uozu (about 25.43 km). Kureha Station had opened on 3 November.
• 190915 June: the Kurikara signal station becomes Kurikara Station, the line's present western terminus.
• 190912 October: the Maibara–Uozu and Tsuruga–Kanagasaki routes are designated the Hokuriku Main Line, bringing the Toyama segment under that trunk-line name.
• 191016 April: the Uozu–Tomari section (about 23.66 km) opens.
• 191215 October: the Tomari–Ōmi section (about 23.34 km) opens; Ichiburi Station, the line's present eastern terminus, opens.
• 196424 August: the Kanazawa–Toyama marshalling-yard section is electrified with 20 kV AC.
• 196525 August: the Toyama marshalling yard–Tomari section is electrified; 30 September: Tomari–Ichiburi (continuing to Itoigawa) is electrified.
• 19691 October: double-tracking and electrification of the whole line are completed.
• 19871 April: with the breakup and privatisation of Japanese National Railways, the line passes to West Japan Railway Company (JR West).
• 201514 March: with the Hokuriku Shinkansen extended from Nagano to Kanazawa, JR West discontinues the conventional Kanazawa–Naoetsu route (177.2 km); the Kurikara–Ichiburi section (100.1 km) is transferred to Ainokaze Toyama Railway and renamed the Ainokaze Toyama Railway Line, with JR Freight retaining Type 2 access.
• 201516 March: the "Ainokaze Liner," an all-reserved limited-stop service, begins running on weekday peaks between Kanazawa and Toyama/Tomari.