Mainline Railworks On3 Curved Track

Mainline Railworks On3 Curved Track is designed specifically for On3 modelers who want reliable operation, realistic proportions, and the distinctive appearance of three-foot narrow gauge railroading in O scale. Whether you're modeling a western mining line, mountain railroad, logging operation, or detailed short line, these precision sectional curves make layout planning simple while providing smooth, dependable performance.

All curved track sections are sold individually, allowing you to build the exact radius, angle, and track plan your railroad requires.

🚂 Designed for On3

The right gauge is only half the story.

On3 uses a three-foot prototype gauge represented in O scale, giving locomotives and rolling stock the impressive size and detail of O scale while capturing the character of narrow gauge railroading.

Mainline Railworks On3 track is purpose-built for On3, with track proportions and detailing designed to complement O scale narrow gauge equipment. The result is a track system that not only operates reliably, but also provides the realistic appearance expected from a detailed On3 railroad.

🚂 Why This Matters

Consistent curve geometry is essential for dependable operation. Properly matched sectional curves simplify layout planning, help maintain reliable alignment, and make it easy to expand your railroad as it grows.

Combined with track designed specifically for On3 equipment, the Mainline Railworks system gives you a reliable foundation for everything from a compact switching layout to a large permanent railroad.

🏔 Perfect For

• Western and mountain narrow gauge railroads

• Mining and logging railroads

• Short lines and branch lines

• Industrial switching layouts

• Compact tabletop and shelf layouts

• Modular railroad systems

• Temporary display layouts

• Expanding existing On3 railroads

🔧 Key Features

• Purpose-built On3 sectional track

• Sold individually for maximum layout flexibility

• Realistic narrow gauge tie size and spacing

• Precision-matched sectional geometry

• Reliable alignment and smooth operation

• Durable construction for repeated assembly and teardown

• Beginner-friendly while scalable for advanced layouts

⚙️ Compatibility

• Compatible with Mainline Railworks On3 sectional track systems

• Designed specifically for On3 locomotives and rolling stock

• Suitable for temporary, modular, and permanent layouts

📐 Curve Geometry Options

Mainline Railworks curved track is available in multiple radius and angle configurations, allowing you to create everything from compact industrial trackage to broad, sweeping curves.

Available Angle Options

A — 22.5° Sections

• 16 sections complete a full circle

• Ideal for balanced loops and general-purpose layouts

B — 11.25° Sections

• 32 sections complete a full circle

• Perfect for smoother transitions and precise track planning

C — 45° Sections

• 8 sections complete a full circle

• Great for compact layouts and rapid assembly

📏 Radius Options

Choose from multiple radii to build:

• Compact layouts

• Mining and logging branches

• Industrial switching districts

• Modular railroads

• Broad scenic mainlines

Smaller radii help maximize available space, while broader curves provide a more open, prototypical appearance and can accommodate longer equipment more comfortably.

➕ Pairs Well With

• Mainline Railworks On3 Straight Track

• Feeder Track Sections

• Tunnel Track Sections

• Bumper Track Sections

• Starter Loop Sets

• On3 Specialty Track Sections

⚠️ Builder Tip

For the smoothest operation, maintain a consistent curve radius through each turn. Mix angle options as needed for precise alignment while keeping the same radius for a clean, flowing appearance.

🛠 Custom Geometry Options

Need a specific radius or custom configuration? Mainline Railworks can produce additional curve geometries and specialty track sections for unique On3 layout requirements.

This 3D printed kit includes the following parts:

• 1x MR-O3C24Ap3-C100 (PLA (Black), 62.5 × 0.8 × 217.4 mm)

• 1x MR-O3C24Ap2-C100 (PLA Wood (Black Walnut), 83.1 × 1.9 × 240.6 mm)

• 1x MR-O3C24Ap1-C100 (PLA (Grey), 95.3 × 6.4 × 243.0 mm)

• 20x Code 100 Micro Engineering Rail