Description

A 3D toy railway sandbox inspired by the old GeoTrax playsets: chunky track, a little motorized engine, and an inviting wooden floor. Build a loop, make a branching yard, or take the railway upstairs. Your layout saves automatically in this browser.

Instructions

• Build: choose a working level and a track piece below the floor, then click empty space to place it. Click existing track on that level to select it; drag it to move it. There is no separate select/build mode. R or Rotate turns the piece through exactly 0°, 90°, 180°, and 270°. A green preview is valid; red means blocked. Compatible endpoints snap within 0.8 world units (one fifth of a full straight), with matching height and opposite directions. Small orange dots mark open ends.
• Move and edit: click a piece on the working level to select it, or drag it elsewhere. Selection actions appear only when you need them. An invalid move keeps its original position. Remove deletes the selected piece; Undo restores earlier layouts. Layout edits pause the train.
• Run: the starter train is already on the track. Use Run train and the speed slider. Place train lets you click any route, including either path through a cross. Train here places it on the selected piece. Reverse backs the engine up. Step 1 s advances it once while paused. At an open end the engine stops with room for its nose; extend the track and press Run to continue.
• Junctions: select a left/right split and use Switch to choose straight or curved departure from its common end. Arrival from either branch merges toward the common end. Crosses keep the train on its incoming straight path; they do not let it turn.
• Elevation: choose Working level: Level 1 is the floor, Level 2 is the first elevated plane, and so on. All new pieces use that level until you change it. The translucent grid shows the active elevated plane; lower track stays visible without stealing your clicks. Every raised piece creates its own supports. A ramp starts at the chosen level and rises one level; check Ramp descends to go down instead. Both lower-track/upper-support collisions and upper-track/lower-support collisions are rejected, regardless of build order. Overpasses need enough vertical clearance and clear support footprints.
• Explore: hold arrow keys to move across the floor at any time, even while a palette button or control has focus. Arrow keys are reserved for walking. Click a palette piece and press R repeatedly before placing it; the preview turns in 90° steps. Drag empty space to orbit, Shift-drag to pan, or scroll to zoom. On touch, drag empty floor to orbit; select and drag a track to move it. More options includes coordinate placement, a top view, camera fitting, and editable examples.