The Nagai Keiben Line between Akayu and Ringou was opened as the feet of citizens living around in 1913 (Taisho 2nd year), and the line is extended to Nagai in the following year.
From then on, with the support from the people, in 2014 ( Heisei 26the year) comes the 100th year of the Line. We thank you very much.
| 1912(Taisho 1st year) | Construction of Nagai Keiben Line started. | |
| 1913(Taisho 2nd year) | Oct. 26th | Nagai Keiben Line opend (from Akayu to Ringou) |
| 1914(Taisho 3nd year) | Nov. 15th | Nagai Keiben Line opened (from Ringou to Nagai) |
| 1922(Taisho 11th year) | Sep. 2nd | Nagai Keiben Line is renamed as Nagai Line |
| 1922(Taisho 11th year) | Dec. 11th | Nagai Line opend (from Nagai to Ayukai) |
| 1923(Taisho 12nd year) | Apr. 22th | Nagai Line completely opened (from Ayukai to Arato) |
| 1954(Showa 29th year) | Nov. 15th | Passenger trains were replaced with diesel multiple units |
| 1959(Showa 34th year) | Jun. 1st | Nishi Miyauchi Station was opened |
| 1960(Showa 35th year) | May 20th | Minami Nagai Station was opened |
| 1968(Showa 43rd year) | Jun. 27th | The union to carry the continuance and revolution of Nagai Line was inaugurated |
| 1972(Showa 47th year) | Oct. 1st | “Goodbye, SL” was implemented |
| 1980(Showa 55th year) | Dec. 27th | “The special measures law for promotion of rebuilding the business of Japanese national railway” was established |
| 1986(Showa 61st year) | Oct. 28th | Approved as the 3rd Special Local Traffic Line |
| 1986(Showa 61st year) | Dec. 3rd | The 1st Unity Measure council on Nagai Specific Local Traffic was held |
| 1987(Showa 62nd year) | Apr. 30th | The 2nd Unity Measure council on Nagai Specific Local Traffic was held |
| Agreement with continuance as the 3rd sector railway. | ||
| 1988(Showa 63th year) | Mar. 24th | The 2nd Unity Measure council on Nagai Specific Local Traffic was held |
| The meeting of promoter of Yamagata Railway Corporation was held. | ||
| Apr. 20th | The general meeting for promotion of Yamagata Railway Corporation was held. | |
| Apr. 26th | Yamagata Railway Corporation was registered. | |
| May 28th | The first type of license for railway business was acquired | |
| Approved as the alternative transportation operator of Minister of Transport | ||
| Oct. 25th | The business of Yamagata Railway Co.,Ltd. was started | |
| Nishi Miyauchi Station was renamed as Orihata | ||
| Nanyo City Hall Station was set up | ||
| 1989(Heisei 1st year) | Dec. 6th | Travel business was started |
| 1989(Heisei 1st year) | Dec. 16th | Shirousagi Station opened |
| 1990(Heisei 2nd year) | Jul. 30th | Added 2 diesel multiple units. (8 in summary) |
| 1992(Heisei 4th year) | Apr. 1st | Ayukai Station was rebuilt. Fureai Square opened.(Shirataka town) |
| 1992(Heisei 4th year) | Jul. 1st | Yamagata Shinkansen opened. The special train for group passengers to Kumanotaisha was stoped to use. |
| 1994(Heisei 6th year) | Apr. 1st | Koguwa Station was rebuilt(Shirataka town) |
| 1994(Heisei 6th year) | Dec. 1st | Applied Automatic Train Stop-Signal New type (ATS-SN) devices |
| 1955(Heisei 7th year) | Mar. 25th | New base building of Yamagata Railway Co.,Ltd. was completed. |
| 1996(Heisei 8th year) | Jan. 10th | Began to introduce terminal of JR tickets for reserved seats into Travel Center. |
| 1996(Heisei 8th year) | Dec. 1st | Rebuild of Tokiniwa(Community Center) was started. |
| 1997(Heisei 9th year) | Mar. 20th | Office building for Arato operation office and CTC Center was completed |
| 1997(Heisei 9th year) | Mar. 22nd | Stop the entrance to Imaizumi~Nagai from JR Yonezawa |
| 1997(Heisei 9th year) | Oct. 23rd | Start to use Centralized Traffic Control (CTC) device. |
| 1998(Heisei 10th year) | Oct. 25th | A ceremony to commemorate the 10th anniversary of the opening of Flower Nagai Line was held |
| 1999(Heisei 11 year) | Jul. 5t | Ringou Station was rebuilt (by log-house Nanyo shi) |
| 1999(Heisei 11 year) | Dec. 1st | Revised fares meanly 10% |
| 2000(Heisei 12th year) | Apr. 23rd | commemoration of the 77th anniversary of the opening of Nagai Line. Operation of Cycle train. |
| 2002(Heisei 14th year) | Jun. 9th | Ayame koen Station opened. |
| 2005(Heisei 17th year) | Aug. 28th | Nagai Junior Chamber set up a huge mural at Nagai Station |
| 2006(Heisei 18th year) | Jan. 30th | “Gallery Station” was set up at Nagai Station by volunteers. |
| 2006(Heisei 18th year) | Oct. 16th | Awarded the special award of Japan Railroad Prize |
| 2007(Heisei 19th year) | Oct. 13th | Shikinosato Station opened (Shirataka town) |
| 2008 (Heisei 20th year) | Oct. 14th | Mogamigawakyouryou was chosen as Civil Engineering Heritage |
| 2008 (Heisei 20th year) | Nov. 9th | Mogamigawakyouryou was approved by Japan Society of Civil Engineers as Civil Engineering Heritage |
| 2009(Heisei 21th year) | Feb. 23rd | Mogamigawakyouryou was approved as Heritage of Industrial Modernization, Ministry of Economy |
| 2015(Heisei 27th year) | Aug. 4th | Nishiotsuka Station(Tateya / platform) and Uzennarita Station (Tateya) were approved as Registered Tangible Cultural Properties of Agency for Cultural Affairs |
©2016 Yamagata Railway Co.,Ltd.
