| Traction | 20 kV 60 Hz AC | Haiki - Huis ten Bosch |
| Non-electric | Huis ten Bosch - Isahaya |
| Opened | 1898 | Tracks | Single track |
| Mapion | Major stations | Connecting lines | Km | City | Prefecture | |
| Map | Map | Sasebo | Matsuura: Nishi-kyūshū | 0.0 | Sasebo-shi | Nagasaki |
| Map | Map | Haiki | JR Kyūshū: Sasebo | 8.9 | Sasebo-shi | Nagasaki |
| Map | Map | Huis ten Bosch | | 13.6 | Sasebo-shi | |
| Map | Map | Takematsu | | 41.7 | Ōmura-shi | |
| Map | Map | Ōmura | | 45.1 | Ōmura-shi | |
| Map | Map | Isahaya | Shimabara: Shimabara Tetsudō, JR Kyūshū: Nagasaki Hon | 56.5 | Isahaya-shi |
| Type | Name | Origin - Major stops - Destination | Trains per day | Fastest train | Average speed |
|---|---|---|---|---|---|
| Limited Express Tokkyū 特急 | Huis ten Bosch ハウステンボス | Hakata - Tosu - Hizen-Yamaguchi - Sasebo line - Haiki - Huis ten Bosch | 5 | 1h44 | 65 km/h |
| Rapid Kaisoku 快速 | Seaside Liner シーサイドライナー | Sasebo - Isahaya - Nagasaki | 13 | 1h32 | 53 km/h |
| Takematsu - Isahaya - Nagasaki | 1 | 46 min | 52 km/h | ||
| Local Futsū 普通 | Sasebo - Isahaya - Nagasaki | 2 | 1h46 | 46 km/h | |
| Sasebo - Isahaya - Nagasaki (old) line - Nagasaki | 5 | 2h05 | 42 km/h | ||
| Sasebo - Isahaya | 1 | 1h21 | 42 km/h | ||
| Haiki - Isahaya - Nagasaki | 1 | 1h46 | 41 km/h | ||
| Haiki - Isahaya - Nagasaki (old) line - Nagasaki | 5 | 2h00 | 40 km/h | ||
| Haiki - Isahaya | 1 | 1h01 | 47 km/h | ||
| Haiki - Huis ten bosch | 2 | 5 min | 56 km/h | ||
| Takematsu - Isahaya - Nagasaki | 1 | 1h01 | 39 km/h | ||
| Takematsu - Isahaya - Nagasaki (old) line - Nagasaki | 1 | 1h33 | 30 km/h | ||
| Takematsu - Isahaya | 2 | 19 min | 47 km/h |