Steam Locomotive Challenger

**Perfil de Impresión Estándar - BIQU B1**
- Thin Walls: Yes
- Skirt: 6 lines (1 layer high)
- Support Angle: 40°
- Support Density: 1
- Interface Height: 0.05mm
- Tree Support: Ø1.5mm branches / Ø2.5mm base
- Tree Top Rate: 1

The Challenger is a large 4-6-6-4 articulated steam locomotive built for fast, heavy freight service. Combining high power with good speed, it handled long trains over mountain grades while maintaining smooth, reliable performance.