buffers and chain coupler

Other heavy trains in Sweden are no more than 3500 t limited by buffers and chain couplers.

Buffers and chain couplers tend to have the two buffers spaced according to the gauge.

The standard buffers and chain couplers used in Europe can only handle 3000 ton t or exceptionally close to 4000 t train weight.

Shaun Maru was only used for carrying newly built cars that would be used in Hokkaidō, because in those days the railways in Hokkaidō employed Janney couplers but the railways in Honshū employed buffers and chain couplers.