Dog nails - Inukugi

Japanese: 犬釘 - いぬくぎ
Dog nails - Inukugi
A nail that secures rails to sleepers, prevents rails from lifting, and maintains the correct gauge. It is named after the shape of its head, which resembles a dog's head. There are also screw nails with threads cut into the shaft. As wooden sleepers made of wood such as chestnut, cypress, Japanese cypress, and beech have disappeared, the use of dog nails has decreased, and instead, the use of PC (prestressed concrete) sleepers and bolts has increased.

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
レールを枕木(まくらぎ)に固定し,レールの浮上りを防ぎ正確な軌間を保持する釘。頭の形がイヌの頭部に似ていることからこの名がある。幹部にねじを切ったねじ釘もある。クリ,ヒノキ,ヒバ,ブナなどの木製枕木が姿を消すにつれ犬釘の使用も減少,かわってPC(プレストレストコンクリート)枕木とボルトの使用が増加している。

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