Walthers HO Track Guide: Code 70 vs Code 83 vs Code 100 (And the Accessories You’ll Want)

If you’ve ever stared at HO track listings and wondered “Which rail code am I supposed to buy?” you’re not alone. Walthers HO track is available in multiple rail sizes (called “codes”), and each one has a sweet spot depending on realism, durability, and what you run on your layout.

This guide breaks down the practical differences between Code 70, Code 83, and Code 100 in plain English—plus the HO track accessories that help your trackwork stay aligned, conduct power reliably, and look finished.

Quick Definition: What Does “Rail Code” Mean?

In HO scale, “rail code” refers to the height of the rail in thousandths of an inch. For example, Code 83 rail is about 0.083" tall. The higher the number, the taller (and generally more rugged) the rail. Smaller codes typically look more realistic for lighter-duty trackage like spurs and yards.

Code 83: The Go-To Choice for Most HO Layouts

If you want one rail code that works for most layouts, Code 83 is often the best balance of realistic appearance and smooth operation. It’s widely used for mainlines and general trackage, and it pairs beautifully with modern HO locomotives and rolling stock.

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Code 100: Durable, Forgiving, and Club-Friendly

Code 100 track is taller and more forgiving. It’s a favorite for club layouts, modular setups, and modelers running older HO equipment with deeper wheel flanges. If your priority is rugged reliability and “it just works,” Code 100 is a strong option.

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Code 70: Fine-Scale Realism for Yards, Spurs, and Branchlines

Code 70 shines where lighter rail belongs: yards, industrial spurs, sidings, and branchlines. Many prototype-focused modelers run Code 83 on the mainline and use Code 70 for secondary trackage to create a realistic “track hierarchy” across the layout.

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Can You Mix Rail Codes on the Same Layout?

Yes—mixing rail codes is common and can make a layout look more realistic. A popular setup is Code 83 for mainlines and Code 70 for yards/spurs. If you’re blending rail sizes, you’ll want the right transition parts and joiners so everything stays aligned and runs smoothly.

Track Accessories That Make Everything Easier

The best trackwork isn’t just about flex track and turnouts—accessories are what help your layout stay reliable during real operation. This is where items like rail joiners, transition joiners, track nails, bumper posts, and extender tracks pay for themselves.

Rail joiners help keep rails aligned and improve electrical continuity.
Transition joiners / transition pieces help connect different rail codes cleanly.
Track nails are great for test-fitting and holding track before ballasting.
Bumper posts finish sidings and help prevent rolling stock from creeping off the end.
Extender tracks help close small gaps and fine-tune your track plan.

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Which One Should You Choose?

Choose Code 83 if you want the best all-around HO track for mainlines and general use.
Choose Code 100 if you want maximum durability, club/modular compatibility, or you run older equipment.
Choose Code 70 if you’re modeling yards, spurs, branchlines, or want a fine-scale look on secondary trackage.

Build Smarter Trackwork with Fusion Scale Hobbies

Whether you’re planning your first HO layout or refining a long-running railroad, choosing the right rail code (and the right accessories) makes your trackwork look better and run smoother. If you’re building a “prototype hierarchy” layout, consider mixing rail codes for realism—and don’t forget the joiners and transition parts that make it all connect cleanly.

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