Spiral defined: http://en.wikipedia.org/wiki/Track_transition_curve 

Staggering rail joints also smoothes out track by inhibiting kinks at
sectional track joints. If at least six inches of rail overlaps the joint of
the other rail in track, the solid rail will help keep the rail with a joint
from kinking on either horizontal or vertical planes. 

If you lay rail in ties and stagger the joints using rail clamps, then use a
dual rail or track bender that bends both rails at the same time, then you
can gradually tighten the rail bender to create a flat curve (as opposed to
a spiral) that begins at a shallow curve and tighten the curve radius until
you reach the minimum radius you allow on your layout or for that section of
track. As your bender passes the tightest area of the curve, gradually
loosen the setting until your curve is straight. Sectional track forces the
train to immediately enter the curve which places lots of force on track and
cargo/passengers.

Gary - AKA Terror Trestle Guy
http://www.angelfire.com/or/trainguy/       web page
http://community.webshots.com/user/raltzenthor    Photos
http://www.youtube.com/user/scudding    Trestle and train crash

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