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What's really neat about the 'chord' system is that easements are so easy to create.  For the first 100 feet, use the offset for a 1 degree curve, the next 100 feet - use the 2 degree offset, getting progressively tighter until the limit is reached as specified by the surveyor;  of course coming out of the curve the procedure would be reversed. Naturally, one could start the easement with something wider than a 1 degree of curvature, 1/2 or 1/4 no doubt, being used on high speed lines.If the tables provide offsets for 1/4 and 1/2 chords, the narrow gauge lines could have just employed a 50 foot chord, using the 1/2 chord offset. Art
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