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A common type of mechanical spring in a form of a helix, manufactured in different styles and sizes for many different applications.
1962 June, “The design of the S.R. electro-diesels”, in Modern Railways, page 395:
The nests of coil springs at each end of the bolster, resting on the spring plank, are in line with the swing links between the swing plank and the one-piece fabricated bogie frame; [...].