Fishplates are usually 600mm long, used in pairs either side of the rail ends and bolted together
( usually six, but sometimes four bolts per joint). The bolts may be oppositely-oriently so that in the
event of a derailment and a wheeel flange striking the joint, only some of the bolts will be sheared,
reducing the likehood of the rails misalinging with each other and exacerbating the seriousness
of the derailment.  Small gaps known as expansion joints are deliberately left between the rail ends
to allow for expansion of the rails in hot weather. The holes through which the fishplates bolts pass
are oval to allow for movement with expansion.

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