The company expanded the railway by means of both construction and acquisition of other companies. As of 1907, it operated of railways in Fukuoka, Kumamoto, Nagasaki, Ōita and Saga prefectures in northern Kyūshū.
On July 1, 1907, the entire operation of the company was purchased by the government of Japan under the Railway Nationalization Act. Consequently the company was dissolved.
| Endpoints (Present station names in parentheses) | Length (miles) | Line names (designated after nationalization) | Notes |
|---|---|---|---|
| Moji – | 143.4 | Kagoshima Main Line | via Ōkura |
| – Usa () | 42.6 | Nippō Main Line | |
| – | 8.8 | Kagoshima Main Line | via |
| – Kami-Yamada | 33.3 | Chikuhō Main Line, Kami-Yamada Line | |
| – | 7.4 | Sasaguri Line | |
| – | 98.6 | Nagasaki Main Line, Sasebo Line, Ōmura Line | |
| – | 26.8 | Karatsu Line | |
| – | 8.1 | Matsuura Line | |
| – | 5.5 | Sasebo Line | |
| – | 15.9 | Misumi Line | |
| – Soeda () | 23.1 | Tagawa Line, Hitahikosan Line | |
| – Ita () | 9.9 | Ita Line | |
| – Kōbukuro | 3.0 | Kōbukuro Line | |
| – Nagao () | 3.6 | Chikuhō Main Line | |
| Gotōji – Miyatoko () | 1.9 | Itoda Line | |
| – Kirino (Chikuzen-Miyada) | 3.2 | Miyada Line | |
| Katsuno – Sugamuta | 2.7 | Tagawa Line | Freight |
| Soeda – Shō | 0.6 | Tagawa Line | Freight |
| Kawara () – Natsuyoshi | 1.5 | Tagawa Line | Freight |
| Gotōji (Tagawa Gotōji) – Kigyō | 0.6 | Gotōji Line | Freight |
| Kawasaki – Daini-Ōtō | 1.2 | Hitahikosan Line | Freight |
| Azamibaru – Yunokibaru | 0.8 | Karatsu Line | Freight |
| Ōchi junction – | 0.5 | Karatsu Line | Freight |
| Ōshima – | 0.8 | Karatsu Line | Freight |
| (Overlap) | (1.0) | Hakata – | |
| Total | 442.8 |
| Year | Steam locomotives | Passenger cars | Freight cars etc. | |
|---|---|---|---|---|
| Wagons | Trucks | |||
| 1890 | 3 | 38 | 107 | |
| 1900 | 159 | 302 | 649 | 3,173 |
| 1906 | 244 | 392 | 1,048 | 5,300 |
The Kyushu Railway History Museum was established near Mojikō Station in Kitakyūshū in 2003. The red-brick main building of the museum is the former headquarters of Kyūshū Railway.