Plan a toy train layout from the tracks you already own
A useful layout starts with three facts: which track pieces you have, how much space you have, and whether the geometry really closes.
Start with inventory, not a picture
Count the track types first. A visually attractive sketch is useless if it needs pieces that are not in your box.
Treat space as a real constraint
Measure the usable floor or table area. A planner should test the layout both directly and rotated by 90 degrees.
Validate before you decorate
Closure, final heading, collisions and track counts should be deterministic checks. AI can help recognition later, but it should not invent track geometry.
Keep instructions with the result
A numbered piece sequence turns a layout from an image into something another person can actually reproduce.
Current v0.2 scope
This preview models S16 straight and R40 / 22.5° curve assumptions only. Switches, crossings, flexible track, physical clearance and exact product compatibility remain separate verification work.