To transport Oya stone, Utsunomiya Railway Company was founded in 1896 and a light railway was constructed four years later to enhance freight transportation. Part of the railway has now been paved and you can enjoy a walk.
The site of Kaineriyama Quarry (Oya History Museum)
Oddly-shaped rocks of Oya (Koshiji Rock)
Oya Magaibutsu (carved Buddha images on a rock face)