duplotrain track editor

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Version and offline access

Offline installation is available in the browser-engine app.

No automatic reload. Download a project before updating. Browser storage may be evicted; keep portable backups.

Projects and backups

Project name

Projects include track, owned pieces and stones, sandbox, view and search settings. Layout JSON stays compatible.

Local projects

Close the loop

slop mm

allow reversing loops (uses the ↔ stone) Search up to added pieces

Search goals and floor constraints

Rank alternatives

Ranking chooses among found alternatives, not a guaranteed global optimum. Exclusions and constraints apply to new searches.

Room rectangle (cm: xmin, ymin, xmax, ymax) Keep-out rectangles (cm, one per line)

Floor-to-ceiling limits include track width and a conservative sampling margin. Existing track must also fit. Origin is the layout's original coordinates.

Exclude individual pieces (owned stock unchanged)

Check layout

Test train

Starting piece and inward direction

Initial switch positions

Choices apply to this test only; trailing passes may change switches. Any edit, including an inventory or sandbox change, resets them.

Find and analyse train routes

Optimise Maximum runs

Highlight unvisited drivable track (orange) Highlight repeating-cycle pieces (teal)

Keyboard / precise selection

Piece Open end

Arm a piece or choose Close the loop, then use an end. Ctrl/Cmd+Z: undo; Shift+Z or Ctrl+Y: redo.

Your sets (one click adds its pieces)

infinite pieces (sandbox)

duplotrain track editor

Close the loop

Your sets (one click adds its pieces)

Action stones (arm one, click a straight)

Pieces (arm one, then click a red arrow)