Model railroading calculators

Track geometry, scale dimensions, layout planning, rolling stock, and model railway operations.

Model Railroad Curve Easement Calculator
Enter your centerline radius, easement length, and total turn to plot a cubic-spiral transition from tangent track into a circular curve. The results give dimensions you can transfer to roadbed, plywood, or a full-size paper template.
Model Railroad Helix Design Calculator
Enter the usable radius, vertical clearance, deck thickness, and desired rise to lay out a buildable helix. The results preserve clearance while rounding the plan to whole construction segments and show every riser elevation.