Model Railroad Track

Model Railroad Track

Choose radius and angle for a model railroad curve

Use the board depth, rolling stock and location of the next joint to choose a curve.

Measure the radius from the centerline

Draw the curve center and measure to the track centerline. Check the width of the roadbed and allow extra space for the ends and sides of cars to overhang as they turn.

Choose the section angle

Use the stated angle per piece to count the arcs required. A short section with the same radius can help place a branch, straight or crossing exactly where your plan needs it.

Test the tightest path

Run the dimensions for the tightest curve and the smallest diverging branch. Check the minimum radius listed for the locomotives and cars you intend to use.

Source documentation

Guide questions

How many 45-degree curves make a circle?

Eight make 360 degrees when joined as one continuous curve with the same radius.

Is a larger radius always a larger piece?

The piece length also depends on the angle. Compare both numbers when fitting a gap.

Can I use flex track to make the same curve?

Use a drawn centerline and suitable support. Check the minimum radius and the match at both ends.

Which accessory suits the job?

  1. The two Atlas curves have different radii. Use the 18-inch one-third piece to adjust an existing 18-inch bend. Choose the 22-inch family if the layout can accommodate a broader turn.

    Atlas 534 HO Code 83 18-inch radius one-third curves ↗Atlas 535 HO Code 83 22-inch radius curves ↗

  2. Four Lionel full O36 sections cover 180 degrees. Four half sections cover 90 degrees at the same radius. Use the smaller arcs to position the next joint.

    Lionel FasTrack O36 full curves, four pack ↗Lionel O36 FasTrack half curves, four pack ↗

Accessories in this guide

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