# Tunnel portal with slab track (Modern Rail and Metro Network)

A 6 m concrete tunnel portal with a horseshoe bore, cornice, splayed wing walls and slab track through it.

- **URL:** https://3dassets.dev/assets/modern-rail-and-metro-network-tunnel-portal-f7d066da
- **GLB (direct, CORS *, immutable):** https://cdn.3dassets.dev/assets/13692/v1/model.glb
- **Download (counted):** https://3dassets.dev/download/modern-rail-and-metro-network-tunnel-portal-f7d066da
- **Licence:** CC0 1.0 Universal: https://creativecommons.org/publicdomain/zero/1.0/ (no attribution required)
- **Contributor:** 3D Assets (@3dassets): https://3dassets.dev/u/3dassets
- **Category:** Roads & Infrastructure
- **Tags:** Modern, Realistic, Modular, Kit / Set
- **Geometry:** 1,800 triangles, 5,400 vertices, 4 meshes, 4 materials, 0 textures
- **Size (m):** 10.72 × 8.08 × 9.3
- **Animations:** none
- **File size:** 0.09 MB
- **Downloads:** 0
- **AI used (contributor-reported):** yes; model: Claude Fable 5.1

## About

A single track tunnel portal 6 m deep: a concrete headwall with a horseshoe bore 6.6 m wide and 6.4 m to the crown, a cornice above it, splayed wing walls each side, a lined bore running back from the face with a cable route and a refuge niche in each side wall, and a slab track floor so the module chains to plain track. Ballast base at y=0, concrete sleeper tops at y=0.41 and railhead top at y=0.60; 1,435 mm gauge with rail centres at x = +/- 0.7525. The module origin sits on the rail-a port at the track centreline and the module runs toward +Z on the 6 m grid. Bounding size 10.72 x 8.08 x 9.30 m (X x Y x Z). Metre units, +Y up, +Z forward, resting at y=0. Static geometry; no rig, collision or navigation data.

## Use with three.js

```js
import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js'

const loader = new GLTFLoader()
loader.load('https://cdn.3dassets.dev/assets/13692/v1/model.glb', (gltf) => {
  scene.add(gltf.scene)
})
```

## React Three Fiber

```jsx
import { useGLTF } from '@react-three/drei'

export function TunnelPortalWithSlabTrackModernRailAndMetroNetwork(props) {
  const { scene } = useGLTF('https://cdn.3dassets.dev/assets/13692/v1/model.glb')
  return <primitive object={scene} {...props} />
}
useGLTF.preload('https://cdn.3dassets.dev/assets/13692/v1/model.glb')
```

## <model-viewer>

```html
<model-viewer src="https://cdn.3dassets.dev/assets/13692/v1/model.glb" alt="Tunnel portal with slab track (Modern Rail and Metro Network)" camera-controls auto-rotate></model-viewer>
```

## Blender

```python
# Blender 4.x: File > Import > glTF 2.0, or from the Python console after downloading the file.
import bpy
bpy.ops.import_scene.gltf(filepath='model.glb')  # from https://cdn.3dassets.dev/assets/13692/v1/model.glb
# Metres and +Y up are converted to Blender's Z-up scene automatically.
```

## Godot

```gdscript
# Godot 4: copy model.glb into res://models/ and the editor imports it as a scene.
var packed := load("res://models/model.glb") as PackedScene
var model := packed.instantiate()
add_child(model)
```

## Unity

```csharp
// Unity: import model.glb with glTFast (Package Manager: com.unity.cloud.gltfast) and drag the prefab in,
// or load it at runtime straight from the CDN:
using GLTFast;
var gltf = new GltfImport();
if (await gltf.Load("https://cdn.3dassets.dev/assets/13692/v1/model.glb")) await gltf.InstantiateMainSceneAsync(transform);
```

---
JSON: https://3dassets.dev/api/v1/assets/modern-rail-and-metro-network-tunnel-portal-f7d066da · Loads with a plain GLTFLoader: no Draco/KTX2 loaders needed.