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Higher number turnouts are longer, because the number is actually a ratio of how far apart the tracks diverge over how many inches. So a #4 is 1" divergence over 4" of travel, while a #6 is 1" over 6" of travel. Higher numbers are better for mainlines or for longer equipment like passenger cars -- the transition to the diverging track is smoother. For a freight yard, #4s are fine, since your trains won't be traveling over them very fast anyway. <br /> <br />Not sure about the "snap switches", but the regular Atlas #4 switchs put the tracks just about 2" from center to center. So a 4-switch ladder will be about 7-8" wide. <br />
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