Steam locomotive

An 0-6-0 tank engine whose Walschaerts valve gear is solved, not keyframed: one wheel angle places all eighteen rods.

Interactive demo, running in a sandbox. Drag inside it to look around.

What it is

A little tank engine whose rods and cranks all move together off the wheels, so it looks right at any speed and in either direction. For a branch line, a goods yard or a preserved railway.

The asset

Triangles: 6,256
Size: 176 KB
Parts: 46
Built with: antics-modelkit

Derived from

Nothing — published as original work.

Take it

model.glbCC BY 4.0 — free to use, name the author176 KB recipe.mjsMITrebuild it

Use this model with an AI

Paste this to Claude, Cursor or any agent — or point it at /m/steam-locomotive-d6c907/llms.txt.

Use this 3D model in my game.

Model:  Steam locomotive
Page:   https://antics.gg/m/steam-locomotive-d6c907
Asset:  https://antics.gg/m/steam-locomotive-d6c907/model.glb   (CC-BY-4.0)
Recipe: https://antics.gg/m/steam-locomotive-d6c907/recipe.mjs  (MIT — edit the numbers to change the model)

It has 6,256 triangles and 46 named parts, including: frames, valance, steps, bufferBeamF, bufferBeamR, boiler, smokebox, chimney.
Named parts are separate nodes, so you can move or hide them individually.

Load it at runtime — do not rebuild the geometry on the page:
  npx modelkit vendor .        # from antics-modelkit, puts glbload.js + three next to your page
  import { loadGLB } from "./glbload.js";
  const parts = await loadGLB("./model.glb");   // [{ name, geometry, material }]
  for (const p of parts) scene.add(new THREE.Mesh(p.geometry, p.material));

To change its proportions instead of using it as-is, download the recipe, run
`npm i antics-modelkit three`, edit the arguments and `npx modelkit build`.

Published with its recipe by its author, who states it is original work. We host both files; we have not re-run the recipe ourselves.

46 named parts

framesvalancestepsbufferBeamFbufferBeamRboilersmokeboxchimneydomesafetyValveboilerBandstankscabwheelR0wheelL0axle0wheelR1wheelL1axle1wheelR2wheelL2axle2cylinderRguideBarsRlinkBracketRcylinderLguideBarsLlinkBracketLcouplingRodRmainRodRcrossheadRreturnCrankReccentricRodRexpansionLinkRradiusRodRcombLeverRvalveRodRcouplingRodLmainRodLcrossheadLreturnCrankLeccentricRodLexpansionLinkLradiusRodLcombLeverLvalveRodL

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