Features

Thirteen manufacturers' track systems are built in, transcribed from published specifications. No fictional track is bundled.

• Z: Peco Streamline
• N: Kato Unitrack, Peco Setrack, Peco Streamline (code 80 and code 55)
• TT: Peco Streamline
• HO: Peco Streamline
• OO: Peco Setrack, Peco Streamline (code 100 and code 75)
• O: Peco Setrack, Peco Streamline (including flat-bottom code 143)

• Click a piece in the catalogue, click the board, and it lands. Bring it near a free connector and it joins exactly, to floating-point precision.
• If two pieces are close but cannot honestly be joined, because the gauges differ or the piece would need swinging round, the app says so instead of forcing it.
• Filter by scale and library, search names and product codes, and keep favourites and recently used pieces.
• Hover cards show each piece's full name, figures, what it joins to, and a warning if it is tighter than your minimum radius.
• Mirroring a turnout swaps it for the opposite-handed catalogue product, so the parts list stays right.
• Place a piece by typing exact coordinates, or by choosing the connector to join, entirely from the keyboard.
• Import your own library from JSON or CSV. The system analyser reports whether the pieces really fit together: whether straights combine, curves divide a circle and turnouts land on the parallel track.

• Draw a flexible run between two points and drag its handle to curve it.
• Construct a smooth curve between two ends by setting the direction of travel at each, or bridge two free connectors.
• Create a parallel track at an exact centreline spacing.
• Split or trim a run at a measured distance, and join runs that meet end to end.
• Extend a stepped transition curve from a free connector.
• Preview the measured result and any radius warnings before applying, as one undoable step.

• Build the baseboard from named modules. Edit each outline as a polygon and add cutouts for operating wells and access hatches.
• The usable area is calculated from the actual surfaces.
• Draw the room from the inner faces of its walls and add fixed obstacles such as columns, radiators and furniture.
• Reserve door swings and walking aisles, and be warned when a board or obstacle intrudes on them.
• Set your reach and standing clearance to map the parts of the board you cannot comfortably get to.

• A catalogue of trees, lineside structures, roads, bridges and turntables held at real-world sizes and converted to your scale when placed.
• Each entry states what its figure is based on. Built things quote what they were built to; grown things quote a typical size and a range.
• Resize anything freely. The inspector notes when an object has departed from its prototype figure rather than forgetting what it was.
• Draw your own rectangles, ellipses, polygons, building footprints and text labels.
• Scenery knows whether it stands on the ground or spans over it, so a bridge over the line is fine and a tree on the line is reported.
• Clear top-down plan artwork, with the accurate footprint always visible.

• Unconnected ends, with a note that a siding or headshunt is meant to have one.
• Mixed scales, joints across different track systems, and misaligned connections.
• Curves tighter than the minimum radius you set for the layout.
• Track that overlaps other track, or runs through scenery standing on the ground.
• Track and scenery crossing board edges, cutouts or gaps between modules.
• Boards that leave the room, touch an obstacle or block a door or aisle.

Issues are explained in plain language and listed in a drawer beside the canvas. Large layouts are checked in the background.

• Layers with visibility, locking and drawing order, including your own layers.
• Named groups that select, move, rotate and copy as one.
• Select Connected Track follows exact joints to pick up a whole run.
• Reusable assemblies: save a selection with its track libraries and drop copies into any layout.
• Cut, copy and paste between layouts. The track libraries a selection needs travel with it.
• A searchable list of every object, and saved camera views for each layout.

• A parts list of every piece on the plan, exportable as CSV.
• Record the stock you already own, pack quantities and your own prices.
• A flexible-track cutting plan that reuses offcuts and owned lengths before buying new ones, with a waste reserve you choose.
• Accessory rules, such as joiners per joint or motors per turnout.
• Subtotals by layer and by board, and a shopping list as CSV.

• Import an image or a PDF page as an underlay, calibrate it from two points a known distance apart, then position, fade and lock it beneath your track.
• Chained length, angle and radius dimensions, and leader callouts.
• Place and adjust dimensions directly on the canvas or by exact coordinates.
• Dimensions appear in SVG, PNG and PDF exports and on printed plans.

• Full-size printing at 1:1 across numbered tiles, with a page map, adjustable overlap and matching registration marks.
• A4, A3 and US Letter, portrait or landscape, or a single-page overview.
• A 100 mm calibration bar on every page, and a correction for printers that do not print quite true.
• Choose which layers to include, and crop to the baseboard or show the room.
• Vector PDF and SVG, PNG at a resolution you choose, and CSV parts lists.

• A native Mac app: standard documents, menus, undo and redo, autosave and printing.
• Light and dark appearance, with canvas contrast measured in both.
• Resizable library, inspector and issues panes that remember how you left them.
• Work the canvas from the keyboard: step through objects, nudge by a grid step or by 1 mm, rotate, mirror and place track precisely.
• Canvas objects are exposed to assistive technology with their name and position.
• Respects Increase Contrast and Reduce Transparency.
• Full documentation, with a page for every feature.

• Layouts are saved as .railplan documents: a single file in the Finder containing readable JSON.
• Track libraries can be embedded in a layout so it opens intact on another Mac.
• A damaged or unfamiliar file is never repaired in place. The app explains what it found and leaves the original untouched.
• Layouts from earlier versions open as they are and are only updated when you save.
• No account, no cloud service and no telemetry.