Ōigawa Railway's locomotives include five characters from the Thomas & Friends series: Thomas the Tank Engine, Hiro, Percy, James the Red Engine, and Rusty.
[2] In September 2022, the Ōigawa Main Line suffered substantial damage from Tropical Storm Talas.
Rail services between Kawane-Onsen Sasamado and Senzu Station were suspended until further notice.
The company also operates a bus line near Sumatakyō Onsen in the town of Kawanehon.
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