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#4 vs #6 Turnouts in HO Scale: Space, Speed and Reliability

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HO model railroad track representing turnout geometry and track planning

Turnout numbers describe geometry, not a simple product size. In simplified terms, a higher-number turnout has a gentler diverging route than a lower-number turnout. That usually means it takes more length on the layout but asks less of long locomotives and cars.

What the turnout number means

A numbered frog expresses how gradually the diverging route separates from the straight route. A #6 is gentler than a #4. The exact overall dimensions still depend on the manufacturer, so do not plan from the number alone—use the drawing or dimensions for the actual turnout you intend to buy.

Where #4 turnouts make sense

A compact turnout can be useful in industrial spurs, small yards and switching layouts where space is limited and speeds are low. Short locomotives and short freight cars are generally less demanding of turnout geometry than long passenger equipment.

Where #6 turnouts earn the extra space

Gentler geometry can help long-wheelbase locomotives, long passenger cars and visually smoother mainline moves. A #6 also spreads parallel tracks apart more gradually, so the complete crossover or ladder still needs to be measured before construction.

Turnout reliability is more than the frog number

Point alignment, wheel gauge, frog design, electrical continuity, track level and the joints immediately before and after the turnout all affect operation. If a car derails only at one turnout, inspect the wheelset and coupler as well as the rails.

Test with your most demanding car

Before fastening track permanently, run the longest passenger car, largest steam locomotive or six-axle diesel you expect to use through both routes at low and moderate speed. A short freight car can hide a geometry problem that a long car exposes immediately.

Pair turnout planning with MM’s HO curve-radius guide and coupler compatibility guide. Browse model trains and track-related inventory as you plan the finished route.

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