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Model Rail - Tools
These are Excel spreadsheets I have written to calculate various 'N' gauge values.
Let me know if you find any errors.
Right Arrow Helix    Radius - Turns - Rise - Slope
Right Arrow Slopes    Rise - Length - Slope
Right Arrow Speeds    Scale speeds - Distance
Right Arrow Wiring Details    See AWG vs. Metric Wire Sizes or Wire Gauge Conversion Chart for S.W.G to A.W.G. conversion information.
Right Arrow Lenz Address Assignments    Plan - A