505 mm
If you are looking to add some creativity and depth to your railway scenery then this is the perfect solution! The Double Curve – 3rd Radius track has a radius of 505 mm, arc of 45° and measures at 405 mm in length.

What is the diameter of a Hornby 3rd radius?

OO Gauge Track Guide

3rd Radius Standard Curve 505 R608
3rd Radius Double Curve 505 R609
4th Radius Standard Curve 572 R8261
4th Radius Double Curve 572 R8262

What is the tightest Hornby curve?

Here’s comparison which I hope looks clear. I’ve shown the extreme of the R605 (this is the tightest curve in Hornby’s range and really only suitable for the smallest models nowadays like 0-4-0 shunters) and the R609, the 3rd. radius. You can see how much the swing out is reduced by using the R609 compared the R605.

### What is the minimum radius for OO gauge model railway?

Most O gauge models are small shunting layouts, as the minimum radius is 7′, and ideally more than that.

What is the width of OO gauge track?

OO gauge is one of several 4 mm-scale standards (4 mm to 1 foot, or 1:76.2), and the only one to be marketed by major manufacturers. The OO track gauge of 16.5 mm (0.65 in) (same as H0 scale) corresponds to prototypical gauge of 4 ft 11⁄2 in, rather than 4 ft 81⁄2 in standard gauge.

What is the smallest radius for OO gauge?

#### How do you measure the radius of a model railway?

Radius is measured from the center of the ties (mid point between the rails). Yes, measure radius to the center of the track. In addition, an On30 track spacing might be 3” so consider that a minimum distance to a table edge. More of each is ideal whether 2” or 10%.

What scale is 00 in mm?

OO gauge or OO scale (also, 00 gauge and 00 scale) is the most popular standard-gauge model railway standard in the United Kingdom, outside of which it is virtually unknown. OO gauge is one of several 4 mm-scale standards (4 mm to 1 foot, or 1:76.2), and the only one to be marketed by major manufacturers.

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