Kato Unitrack · geometry
Kato Unitrack geometry, in plain words
The facts RailMind's snapping and closure solver are built on — the ones that decide whether a plan closes on the table. Four short articles, each ending in a plan that uses it.
How many R282 curves close a loop?
Eight 45° curves are a circle; two equal straights make it an oval; why an odd number of 45° curves never closes; the figure-8 sum; sixteen in HO.
Why it won't closeWhy won't my Unitrack loop close?
The five reasons, in the solver's own terms — the turn lattice, unmatched straights, the 33 mm that is 32.779, the expansion track RailMind excludes, and the one-turnout reverse loop.
33 mmDouble-track spacing and concentric curves
Every concentric pair in the catalog, R117/R150 to R448/R481, and how a #4 or #6 turnout reaches parallel.
HOHO Unitrack basics
22.5° curves, sixteen to a circle; the fixed-length straights; the turnouts and the one crossing; what Kato does not make in HO.
The plans
Five example layouts with their parts lists are under Layouts.