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The reverse curves of a join start and end at the joined ends, with the largest radius that fits, so a shift of the track spacing (4 -> 4.75 m over 400 m) is one S instead of two curves with straights around them. A straight or a single arc with a kink at its ends, though still under the joints check, comes after the smooth curves among the variants; a practically exact one stays first. An element under 1 mm, like the straight left between the reverse curves by the radius fit, no longer drops out of the pieces and leaves a gap: the neighbouring piece takes it over.