Shimabara Railway also operates buses, taxis and passenger ferries; as well as other non-transport ventures. 
Nagasaki Prefecture and Cities in Shimabara area came to hold stocks in the company after an eruption disaster of Unzen Fugen-dake in an effort to increase capital.
- May 5, 1908: Shimabara Railway Co., Ltd. established.
- September 24, 1913: Line from Isahaya to Shimabara Minato (now South Shimabara) opened.
- April 10, 1919: Kuchinotsu Railway Co., Ltd. established.
- April 22, 1922: Kuchinotsu Railway line from Shimabara Minato to Dozaki opened.
- March 1, 1928: Kuchinotsu Railway line from Kazusa to Shimabara Minato opened.
- December 5, 1930: Shimabara Railway bus service established.
- June 1, 1935: Shimabara Railway line to Unzen opened (discontinued 1938).
- 1935: Kuchinotsu Railway bus service established.
- 1938: Kuchinotsu Railway buys Oniike route.
- July 1, 1943: Shimabara and Kuchinotsu Railway companies merge.
- July 1956 Island Tourist Rail Co., Ltd. established.
- March 1966 Island Rail Taxi Co., Ltd. established.
- July 1978 Isahaya Terminal Hotel opened.
- November 1990-June 1991: Eruption of Mount Unzen; service from Fukae to Shimabara discontinued.
- October 1995: Nagasaki and cities and towns along the line increase their stock holdings in the company.
- April 1, 1997: Fukae-Shimabara service resumed after reconstruction work. Tourist tram train operation started.
- August 1997: Shimabara - Omuta route opened; Shimatetsu high speed passenger ship service began.
- April 1, 2008 - Rail service from Shimabara-Gaikō to Kazusa discontinued.
- "鉄道事業、一般乗合旅客自動車運送事業、一般貸切旅客自動車運送事業、船舶運送事業、ホテル事業、不動産賃貸事業". Retrieved 16 October 2015.
- "資本金 800,000,000円". Retrieved 16 October 2015.
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