Click to expand Tap to zoom Hornby R609 Double Curve 3rd Radius - OO Gauge by Hornby Sold out £4.75 | / SKU R609 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out 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 505mm, arc of 45° and measures at 405mm in length.